PV4-118310
PV4-118310
TABLE OF CONTENTS
1. About your new GrudgeBox
2. Features and gear ratios
3. GrudgeBox – Behind the name
4. Required parts, tools, and reference materials
5. Included parts
6. Bearing door exploded view
7. Bearing door parts list
8. Gearset exploded view
9. Gearset parts list
10. Tapered bearing exploded view and parts list
11. Shift system exploded view and parts list
12. Torque specifications and stock component removal
13. Transmission case preparation
14. Tapered bearing adapter preparation
15. Heating the transmission case
16. Tapered bearing adapter installation
17. Countershaft bearing and main drive gear installation
18. Main drive gear installation
19. Setting up end play in the tapered roller bearings
20. Seal and pulley spacer installation
21. Shifter pawl and gearset installation
22. Gearset installation
23. Finish line and ECM re-flash
24. Wiring diagram for reverse N1 pattern kill drums
25. Terms & conditions
26. Transmission oil change log
27. General maintenance log
GRUDGEBOX TRANSMISSION KIT
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INTRODUCTION
The GrudgeBox is an all spur 6-speed overdrive transmission that delivers uncompromised
performance in all gears and significantly more torque capacity than the stock unit. The primary
impetus for the design was performance, but the GrudgeBox was also designed for those who
spend a lot of time in the saddle looking for that extra gear on the highway. 6th gear is a true
overdrive that is numerically mild to yield a 250 RPM drop as compared to the stock unit. The
gearset fits into the stock transmission case with no modifications. It has earned its BAKER
pedigree with extensive highway testing and many merciless passes at the dragstrip.
FITMENT
• 2006 – Later Dyna
• 2007 – Later Softail & Touring Models
BREAK-IN
The GrudgeBox requires no break-in schedule. However, we do recommend that you take it
easy for the first 20 miles to confirm that there are no issues related to basic function of the
transmission and the reassembly of the motorcycle. You will notice that the transmission will
shift smoother and operate quieter after about 2500 miles. Like any machine, scheduled oil
changes are key to years of trouble-free service. Log your transmission oil changes at the
recommended intervals on page 26. General maintenance can be logged on page 27.
FLUIDS
The GrudgeBox requires 28-32 oz. of transmission fluid. We recommend Spectro 6-speed
transmission oil that has long chain polymers that stand up to the harsh environment that this
high-performance transmission can deliver. Please follow the recommended oil change intervals
on page 26 and document your transmission service history. The exception to the stated
intervals is winter storage. If the bike is stored in an environment that has significant
temperature fluctuations, there will be water condensation inside the transmission. The oil
should be changed immediately when it comes out of storage and is put back into service.
WARRANTY
This product includes a 5-year, 50,000-mile warranty. All steps in these instructions must be
completed as outlined for the warranty to remain valid.
ABOUT YOUR NEW GRUDGEBOX
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FEATURES
The GrudgeBox is the most innovative, well executed, robust transmission we have ever
endeavored to design and manufacture. Significant GrudgeBox features include:
1. 6-Speed overdrive design. The 5th gear ratio of the GrudgeBox is 1:1 which is
equivalent to the stock transmission 6th gear ratio. The overdriven 6th gear ratio offers a
250 RPM reduction for highway cruising.
2. Straight cut (spur) gears. Gear School 101. Helical gears are used in most
motorcycles and cars these days because they are quieter than spur gears. However,
there’s a cost for noise reduction because helical gears give up horsepower. The
amount of horsepower given up is proportional to the angle of the helix on a given gear
pair. The stock transmission has helical gears in 2nd through 6th. The GrudgeBox is
configured with all spur gears and no sacrificed horsepower.
3. Gear width. Stock transmission gear engagement is typically .500”, GrudgeBox is .700”
in 1st through 4th with nearly twice the circumferential tooth thickness. Generally
speaking, torque capacity of a transmission is the product of the gearset center distance,
gear engagement width, and circumferential tooth thickness at the pitch line.
4. Tapered roller main drive gear bearing. We replaced the problematic self-aligning
stock main drive gear bearing with a tried-n-true opposing tapered roller bearing pair;
patent pending. We did this because any transmission is only as strong as its weakest
link.
5. Dog tooth engagement. The dog teeth on the stock 3rd and 4th gears have roughly
.200” axial engagement with a less-than 1° undercut. This is a formula for gear hop-out.
For the GrudgeBox we chose 4° undercuts with .250” axial engagement in all positions
to guarantee NO gear hop-out or missed shifts, which translates into NO lost revenue if
you are a Grudge hustler.
6. Direct acting shifter pawl. Upshifting with the stock 07-later shifter pawl is much like
pushing on a rope. To make upshifts crisp and precise, we developed a direct acting
pawl that engages the drum pins with negligible free play and no ropes.
GEAR RATIOS
FEATURES AND GEAR RATIOS
GrudgeBox
1st – 3.20
2nd – 2.21
3rd – 1.61
4th – 1.27
5th – 1.00
6th – 0.92
Stock H-D
1st – 3.34
2nd – 2.31
3rd – 1.72
4th – 1.39
5th – 1.19
6th – 1.00
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FIGURE 1 | GRUDGEBOX SLEEPER DOOR
GRUDGEBOX – BEHIND THE NAME
Grudge racing is street racing, often done illegally, in which real dollars are bet on a single race.
As such, the internal configuration of the engine and drivetrain are a closely guarded secret to
gain an advantage over the competitors. The GrudgeBox was conceived to be a highperformance transmission with performance inspired gear ratios but no outward appearance to
give away the fact that a thoroughbred torque multiplying machine occupies the inner walls of
the transmission case.
The GrudgeBox is available with different bearing door finishes: machined billet, chrome, polish,
powdercoat with highlights, and Sleeper. The Sleeper door is available to achieve the
aforementioned anonymity. To make the Sleeper door we apply mechanical taxidermy to a
stock factory door by milling out all anatomy and bone structure on the stock door to leave a
.125” thick shell with stock factory powdercoat. The shell then fits over a billet sub-door, like a
3D puzzle, to yield the Sleeper door which fathered the name GrudgeBox (figure 1). Externally,
the GrudgeBox with the Sleeper door gives no indication that a drag racing transmission lives
underneath and that may be the difference between winning and losing.
Three different shift drum configurations are offered; standard pattern (1-N-2-3-4-5-6),
N1 pattern (N-1-2-3-4-5-6), and reverse N1 pattern kill (6-5-4-3-2-1-N).
The N1 drum is similar to the standard pattern drum, but neutral is relocated from the standard
position between 1st and 2nd to the position below 1st gear. The N1 drum makes it
effortless/mindless to find neutral. Racers, those who live in mountainous regions, and people
with restricted foot and leg mobility rely on the N1 pattern to find neutral every time without
having to think about it.
Reverse N1 pattern kill drums are for the advanced disciples of the quarter-mile club. As the
name implies, reverse N1 pattern is just like the aforementioned N1 pattern but reversed. To
upshift, you stomp down on the lever. The “kill” part relates to repurposing the neutral switch to
allow for clutchless upshifts and downshifts. See page 26 for wiring diagram.
GRUDGEBOX TRANSMISSION KIT
WHY GRUDGEBOX?
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REQUIRED PARTS, TOOLS, & REFERENCE MATERIALS
To install the GrudgeBox Transmission Kit, the following is required:
• Factory Service Manual for your year and model motorcycle
• Common hand tools (allen wrenches, sockets, retaining ring pliers, etc.)
• Breaker bar, 1/2" drive
• Torque wrenches, 3/8” & 1/2” drive
• 1-3/16” socket, 6 pt, 1/2” drive
• Red and blue threadlocker
• A new primary cover gasket
• Dial indicator (.0005” increments)
• MAP/Propane gas or heat gun
• Main drive gear & bearing service tool
o BAKER TOOLA-07
o H-D equivalent 35316C
• Inner primary race service tool
o BAKER TOOLB-56
o H-D equivalent 34902B
• Pulley locking tool
o BAKER TOOLC-56
o H-D equivalent 46282
• Pulley nut socket
o BAKER TOOLD-07
o H-D equivalent 47910
• Countershaft bearing service tool
o BAKER TOOLE-07
• Primary drive locking tool
o H-D-48219 (Touring models)
o H-D-47977 (Softail/Dyna)
• Primary fluid, 40 oz. (Touring models) or 46 oz. (Softail/Dyna)
o BAKER recommends Spectro Heavy Duty Primary Chain Case Oil; R.HDPCO
• Transmission fluid, 28-32 oz.
o BAKER recommends Spectro Heavy Duty Platinum 6 Speed Transmission Oil;
BD-75140-32
HIGHLY RECOMMENDED ADDITIONAL PART
Baker Drivetrain highly recommends that the automatic chain
tensioner be replaced with a Baker Attitude Adjuster (figure 1).
Extensive testing and durability miles have proven that our
Attitude Adjuster (P/N 177-67K) puts less shear stress load on
the motor sprocket shaft and the transmission mainshaft, thereby
extending the life of the drivetrain components.
NOTE: DOES NOT FIT 2018-LATER SOFTAILS WITH MID CONTROLS
WHAT DO I NEED?
FIGURE 2 | BAKER ATTITUDE ADJUSTER
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GrudgeBox gearset w/ shift system
5/16”-18 SHCS, stainless, 73497
Washers, stainless, 6100
Shifter pawl, 555-GB-A
Shifter pawl washer, 6497HW
Shifter pawl retaining ring, 68010
Shifter pawl seal, 37101-84B
Countershaft bearing, 8963
Tapered roller bearing, HR32910J
Tapered roller bearing adapter, 11610-GB
Pulley spacer w/ O-ring, 33334-GB | OR568M52
Main drive gear seal, 12074-67
85mm beveled internal retaining ring, VHO-334STPA
.102” bearing spacer, 11615-GB, white (shown)
.104” bearing spacer, 11620-GB, green (pre-installed)
.106” bearing spacer, 11625-GB, blue (shown)
WHAT’S INCLUDED IN MY KIT?
Bearing door gasket, 35654-67
Top cover gasket, 34917-06-F (shown)
25700453 (M8)
Side cover gasket, 36805-06-F
Speed sensor spacer, 132-56R
Bearing adapter installation cup, T855-GB
Inner primary bearing, P205PP-H
Inner primary bearing seal, 25X52X07ADL
Side cover emblem, EMBLEM-GB
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BEARING DOOR EXPLODED VIEW
FIGURE 3 | EXPLODED VIEW, BEARING DOOR
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ITEM P/N QTY DESCRIPTION
1 24050 4 Button head cap screw, 1/4"-20 x .625”
2 25C62KFC 2 Flat head cap screw, 1/4"-20 x .625”
3 481C-6 1 Retainer plate, door bearings
4 7340BD 2 Nut, 1-1/8" socket, mainshaft & countershaft
5 6304 2 Bearing, radial ball, 52mm
6 26735 2 Dowel, 3/16” x .500”
7 36805-06F 1 Gasket, side cover
8 73497 8 Socket head cap screw, stainless, 5/16”-18 x 1.500”
9 6100 8 Washer, stainless, .341” x .560” x .058”
10 108-GB 1 Bearing door, GrudgeBox, chrome
118-GB 1 Bearing door, GrudgeBox, black w/ highlight
119-GB 1 Bearing door, GrudgeBox, Sleeper
11 35654-67 1 Gasket, bearing door
12 16583-67 2 Hollow dowel, 10mm x .375”
13 F1409 1 Magnet, .265” x .750” x .250”
14 25C75KCS 1 Socket head cap screw, 1/4"-20 x .750”
15 N/A 1 GrudgeBox gearset w/ shift system
16 25X52X07ADL 1 Seal, inner primary, 25 x 52 x 7mm
17 P205PP-H 1 Bearing, inner primary, 25 x 52 x 15mm
18 34917-06F 1 Gasket, top cover, 2006/07 – Later
25700453 1 Gasket, top cover, 2017/18 – Later M8
19 132-56R 1 Spacer, speed sensor, .100”
BEARING DOOR PARTS LIST
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GEARSET EXPLODED VIEW
FIGURE 4 | EXPLODED VIEW, GEARSET
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ITEM P/N QTY DESCRIPTION
1 12035B 1 Seal, main drive gear, 25 x 32 x 6mm
2 125RRBI 2 Retaining ring, internal, 1.250”
3 HK2520 2 Bearing, drawn cup needle, 25 x 32 x 20mm
4 11599-90 1 Spacer, main drive gear, 1.060” x 1.250” x 1.225”
5 5M-GBW 1 5th gear, mainshaft, 31T, spur
6 DC45-GB 1 Dog clutch, 4th-5th gear, GrudgeBox, all
7 11067 5 Retaining ring, external, eaton style, 30mm
8 6003B 4 Thrust washer, 1.185” x 1.380” x .071”
9 VS-275 1 Retaining ring, external, 2.750”
10 BD-7241 1 Reluctor ring, 41T
11 4M-GBWZ 1 4th gear, mainshaft, 28T, spur
12 8876A 4 Bearing, split cage needle, 26 x 30 x 13mm
13 AS3047 2 Thrust washer, 1.185” x 1.843” x .039”
14 6M-GBW 1 6th gear, mainshaft, 32T, spur
15 BD-11081 1 Thrust washer, splined, 1.185” x 1.430” x .125”
16 11082 2 Segment ring, 1.102” x 1.280” x .056”
17 2M-GB 1 2nd gear, mainshaft, 21T, spur
18 3M-GB 1 3rd gear, mainshaft, 25T, spur
19 BD-3042 1 Thrust washer, 1.185” x 1.645” x .039”
20 MS-GB 1 Mainshaft & 1st gear, 16T, spur
21 CS-GB 1 Countershaft
22 8963 1 Bearing, drawn cup needle, 30 x 37 x 21mm
23 5C-GBW 1 5th gear, countershaft, 20T, spur
24 4C-GBWZ 1 4th gear, countershaft, 23T, spur
25 6C-GBW 1 6th gear, countershaft, 19T, spur
26 2C-GB 1 2nd gear, countershaft, 30T, spur
27 3C-GB 1 3rd gear, countershaft, 26T, spur
28 TWD1423 1 Thrust washer, .883” x 1.420” x .125”
29 K22X26X17 1 Bearing, caged needle, 22 x 26 x 17mm
30 1C-GB 1 1st gear, countershaft, 33T, spur
31 BD-2035 1 Thrust washer, .791” x 1.361” x .107”
GEARSET PARTS LIST
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ITEM P/N QTY DESCRIPTION
1 5M-GBW 1 5th gear, mainshaft, 31T, spur
2 OR568132 1 O-ring, Buna #132
3 HR32910J 2 Bearing, tapered roller, 50 x 72 x 15mm
4 11610-GB 1 Adapter, tapered roller bearings
5 11615-GB 1 Spacer, tapered roller bearings, .102”, white**
11620-GB 1 Spacer, tapered roller bearings, .104”, green*
11625-GB 1 Spacer, tapered roller bearings, .106”, blue**
6 OR568M52 1 O-ring, pulley / sprocket spacer, 52mm
7 33334-GB 1 Spacer, pulley / sprocket
8 1302-334PP 1 Retaining ring, beveled internal, 85mm
9 12074-67 1 Seal, main drive gear, 2.380” x 3.375” x .285”
FIGURE 5 | EXPLODED VIEW, TAPERED ROLLER BEARING
* .104” spacer (green) is pre-installed on the main drive gear
** .102” (white) and .106” (blue) spacers are included separately in your kit
TAPERED BEARING EXPLODED VIEW AND PARTS LIST
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ITEM P/N QTY DESCRIPTION
1 200-GB-A 1 Shift system, standard pattern
200-GBN1-A 1 Shift system, N1 pattern
200-GBN1RK-A 1 Shift system, reverse N1 pattern w/ kill
2 23205 3 Socket head cap screw, 1/4"-20 x .750”
3 102-GB 1 Shift fork, 2nd gear, mainshaft
4 101-GB 1 Shift fork, 4-5 dog clutch, mainshaft
5 35224-GB 1 Fork rod, mainshaft, 6.285”
6 103-GB 1 Shift fork, 3rd Gear, countershaft
7 35222-67 1 Fork rod, countershaft, 4.825”
8 555-GB-A 1 Shifter pawl
9 37101-84B 1 Seal, shifter pawl, .500” x .750” x .170”
10 6497HW 1 Washer, .459” x 1.125” x .045”
11 68010 1 Snap ring, external, .4375
SHIFT SYSTEM EXPLODED VIEW AND PARTS LIST
FIGURE 6 | EXPLODED VIEW, SHIFT SYSTEM
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BEFORE YOU BEGIN
The transmission is a component in the powertrain of your motorcycle. As such, it’s function is
highly dependent on other components in the powertrain to perform as designed. If the clutch,
clutch actuator, primary, or shift linkage is worn, tired, or compromised in any way, the
transmission will not perform as designed. The process of installing the GrudgeBox is the
perfect time to assess and freshen up these components to ensure the transmission gives you
years of trouble-free service.
TORQUE SPECIFICATIONS
THREAD APPLICATION TORQUE VALUE THREADLOCKER
Side cover, top cover, derby
1/4"-20 cover, outer primary, VSS, 132 – 156 in-lb Blue recommended
pulley locking plate
5/16”-18 Bearing door, inner primary 22 – 25 ft-lb Blue recommended
5/16”-24 Shift arm pinch bolt 18 – 22 ft-lb Blue recommended
9/16”-12 Comp sprocket bolt See Factory Service Manual Red required
3/4”-18 Clutch nut 70 – 80 ft-lb Red required
1-3/4”-20 Pulley/sprocket nut 100 ft-lb, loosen 1 full turn, Red required
then 35 ft-lb + 35° – 40°
9/16”-18 Neutral switch 120 – 180 in-lb None
3/4”-16 Transmission dipstick 25 – 75 in-lb None
1/2”-20 Transmission drain plug 14 – 21 ft-lb None
1/2”-20 Primary drain plug 14 – 21 ft-lb None
STOCK COMPONENT REMOVAL
Refer to your Factory Service Manual for detailed instructions on how to remove your stock
gearset, main drive gear, shifter pawl, and speed sensor from the transmission case. Softails,
Dynas, and Touring models are all different configurations and require different methods to
accomplish the removal. Ensure that you have the correct Factory Service Manual for your year
and model of motorcycle.
BERT TIPS:
Apply heat to the comp sprocket bolt head prior to removal. Failure to do so could result
in mangled sprocket shaft threads and halt the installation of your GrudgeBox.
Remove the dipstick prior to removing the gearset from the transmission case. Failure to
do so will result in a broken dipstick and a trip to the nearest H-D dealer.
GRUDGEBOX TRANSMISSION KIT
BEFORE INSTALLING YOUR GRUDGEBOX
THE COUNTERSHAFT CUP BEARING MUST BE REMOVED FROM THE
TRANSMISSION CASE AT THIS TIME. USE BAKER TOOLE-07 OR EQUIVALENT.
A REPLACEMENT IS PROVIDED IN YOUR KIT, BUT IT WILL BE INSTALLED
AFTER THE TAPERED BEARING ADAPTER.
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TRANSMISSION CASE PREPARATION
Surgically clean the left side of the transmission case in preparation for installing the new
GrudgeBox main drive gear and gearset. This surgical cleansing includes the main drive gear
and countershaft bearing boss areas, the three inner primary mount bosses, and the shifter
pawl boss. See figure 7.
The bearing boss areas must be clean to ensure that no dirt or debris scores the bearing bores
during the removal of old bearings and installation of new ones. The three inner primary mount
bosses need to be clean so that the tool plate registers flat on the left side transmission case.
BEFORE INSTALLING YOUR GRUDGEBOX
FIGURE 7 | SURGICALLY CLEAN THE LEFT SIDE OF THE
TRANSMISSION CASE IN THE AREAS INDICATED ABOVE
VISIT THE BAKER DRIVETRAIN YOUTUBE CHANNEL AND WATCH
CLASS #4
. IN THIS VIDEO, WE SHOW YOU HOW TO INSTALL THE
TAPERED ROLLER BEARING ADAPTER AND MAIN DRIVE GEAR.
WATCHING THE VIDEO AHEAD OF TIME WILL GIVE YOU THE TIPS,
TRICKS, AND KNOWLEDGE TO ENSURE A PROPER INSTALLATION.
CAUTIONARY NOTE
There are special tools available from other manufacturers that remove and install the
countershaft cup bearing, but they all have one fundamental error – they push on the inside of
the cup (from right to left in the motorcycle) for removal and installation. THIS IS WRONG! Cup
bearings require that the installation force be applied to the outside of the cup (from left to
right). BAKER TOOLE-07 (sold separately) applies removal and installation forces in the
proper direction.
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TAPERED BEARING ADAPTER INSTALLATION
INSTALLING THE TAPERED BEARING ADAPTER
1. Apply a thin coating of oil to the outer
diameter of the tapered bearing
adapter. Do the same to the main
drive gear bearing bore in the
transmission case.
2. Use the aluminum cup provided in
your kit in combination with the main
drive gear installation tool (BAKER
TOOLA-07 or H-D equivalent 35316C)
to install the tapered bearing adapter.
Refer to the section on installing the
main drive gear bearing in your
Factory Service Manual. The tool will
be set up in a similar manner, but with
a few key differences. The tapered
bearing adapter will take the place of
the traditional main drive gear bearing,
and the included aluminum cup will
take the place of the bearing driver.
See figures 8 and 9 for the proper tool
setup.
3. Assemble the tool with the stepped
down portion of the tapered bearing
adapter facing toward the inside of the
case; see figure 10. Make sure that
the adapter is square to the bearing
bore and snug the tool nut. If the
adapter is not square to the bore,
loosen the nut and realign the adapter.
Leave the nut snug. Do not press
the adapter into the case.
FIGURE 9 | TAPERED BEARING ADAPTER
TOOL SETUP, LEFT SIDE VIEW
FIGURE 8 | TAPERED BEARING ADAPTER
TOOL SETUP, RIGHT SIDE VIEW
FIGURE 10 | TAPERED BEARING ADAPTER
ORIENTATION IN CASE, TOP VIEW
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INSTALLING THE TAPERED BEARING ADAPTER
4. The tapered bearing adapter has
a tighter press fit into the
transmission case than the stock
bearing. To ensure successful
installation of the tapered bearing
adapter and longevity of the
installation tool, you must heat the
transmission case as shown in
figure 11. Use a MAP/propane
torch or a heat gun as shown in
figure 12.
5. Apply heat evenly around the boss
of the main drive gear bearing bore
from the outside of the case as
shown in figure 14. DO NOT heat
the boss from the inside of the case
and keep heat away from the
tapered bearing adapter that is
staged and ready for installation.
The bearing bore boss should be
heated to at least 200°F. BAKER
recommends using an infrared
thermometer to verify that the case
is adequately heated; see figure 13.
FIGURE 11 | APPLY HEAT AROUND THE
MAIN DRIVE GEAR BEARING BOSS AREA
FIGURE 12 | USE MAP/PROPANE GAS
OR A HEAT GUN TO HEAT THE CASE
FIGURE 13 | USE AN INFRARED
THERMOMETER TO VERIFY THAT THE
CASE IS HEATED TO AT LEAST 200° F
BERT TIP:
You may see some discoloration
where the case is heated.
Restore color by rubbing a little
bit of WD-40® or another thin oil
into the powdercoat.
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FIGURE 16 | BEVELED RETAINING RING
WITH BEVEL FACING OUTWARD
INSTALLING THE TAPERED BEARING ADAPTER
BEVEL ON RETAINING RING
MUST FACE OUTWARD
6. Immediately after the case is heated,
tighten the tool nut to draw the tapered
bearing adapter into the case. This
operation must be done quickly with no
interruptions while the case is hot. If
the support plate on the other side of
the case starts to bend, stop, loosen
the nut slightly, and reheat the case.
The aluminum cup should be about
flush with the bearing boss when the
tapered bearing adapter is fully seated;
see figure 14.
BERT TIP:
Do not over tighten the nut after the
tapered bearing adapter is bottomed
out. Doing so may damage the tool
or main drive gear bearing bore
landing in the case.
7. Remove the installation tool. You will
know the tapered bearing adapter is
seated into the bore when the beveled
retaining ring groove is fully visible;
see figure 15.
8. Install the beveled retaining ring
(VHO-334STPA) with the bevel facing
outward. Make sure that the retaining
ring fully seats into the groove; see
figure 16.
FIGURE 14 | TAPERED BEARING
ADAPTER FULLY SEATED IN CASE
FIGURE 15 | TAPERED BEARING
ADAPTER VISUAL INSPECTION
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1. It is now time to install the new countershaft bearing that was provided in your kit. It is
important that this step be done AFTER installing the tapered bearing adapter. This is to
avoid cooking your new countershaft bearing while heating the case in that step.
2. Wipe out the countershaft bearing bore with a clean rag. Apply a thin coating of oil to both
the bearing bore and the outer diameter of the countershaft bearing.
3. Use a countershaft bearing tool (BAKER TOOLE-07 or equivalent) to press the bearing into
the transmission case. You want to press on the outside of the ‘cup’, just as you did during
removal. See the appropriate tool instructions and your Factory Service Manual for details.
1. Before installing the main drive gear,
apply a thin coating of transmission oil
to the tapered bearing races and the
main drive gear O-ring; see figure 17.
A thicker oil could give you a false
reading when checking endplay.
2. Each kit comes with three spacers for
setting up end play in the tapered
roller bearings: .102” (white), .104”
(green) and .106” (blue) thick. The
most commonly used spacer (.104”,
green) is pre-installed on the main
drive gear. The .102” and .106”
spacers are included for cases where
bearing end play is outside of the
acceptable range with the preinstalled .104” spacer; see figure 18.
Apply a thin coating of transmission oil
to the main drive gear O-ring each
time you change the spacer.
FIGURE 18 | MAIN DRIVE GEAR WITH PRE-INSTALLED
SPACER AND TWO EXTRA SPACERS; LUBE O-RING
COUNTERSHAFT BEARING INSTALLATION
MAIN DRIVE GEAR INSTALLATION
INSTALLING THE C/S BEARING & MAIN DRIVE GEAR
FIGURE 17 | LIGHTLY OIL BEARING RACES
BEFORE INSTALLING THE MAIN DRIVE GEAR
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3. Follow the Factory Service Manual
to install the main drive gear using
BAKER TOOLA-07 or H-D
equivalent 35316C. If the H-D
equivalent tool is used, you will need
to use pulley spacer 33334-GB from
your kit for extra spacing while
pressing the tapered bearings
together.
If you need to use the pulley spacer
(33334-GB), temporarily remove the
O-ring. Remember to re-install it after
the end play is set.
4. Gently slide the assembled main drive
gear through the case. Take the loose
tapered roller bearing (HR32910J) and
slide it over the main drive gear, letter
side facing out. Slide the pulley spacer
onto the gear if needed (O-ring groove
facing bearing), followed by the
remaining press tools; see figure 19.
INSTALLING THE MAIN DRIVE GEAR
5. With the tooling installed, snug the
assembly by hand while making sure
the installation tool cup is properly
aligned and not skewed to the side of
the tapered bearing. Hold the bolt on
the inside of the case using the proper
socket and ratchet. Tighten the main
drive gear tooling on the primary side
of the bike until it is fully seated and
tight. Refer to the main drive gear tool
instructions and figure 20.
FIGURE 19 | IF USING H-D TOOLING, THE
PULLEY SPACER IS NEEDED TO EXTEND
THE LENGTH OF THE INSTALLATION CUP
FIGURE 20 | INSTALLING THE MAIN DRIVE GEAR
BERT TIP:
Apply pressure to the main drive
gear during this step by reaching
your left hand through the top of the
transmission case. Failure to do so
(i.e. allowing the gear to flop around)
will damage the bearing races.
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FIGURE 21 | CHECKING AXIAL END PLAY IN THE
MAIN DRIVE GEAR TAPERED ROLLER BEARING
INSTALLING THE MAIN DRIVE GEAR
6. Do not remove the installation tool yet;
leave everything tight. Measure the
amount of end play in the main drive gear
assembly using a dial indicator with .0005”
increments as shown in figure 21. Total
axial end play (pulling / pushing on the
gear) must be between .0005” and
.002”. It is extremely important that your
bearing end play is within this range, as
anything too tight or too loose may lead to
transmission failure.
Measuring end play is tricky. The end play
measurement can easily be skewed if
radial or rotational forces are applied, so
try to keep all movement in the axial
direction (parallel to the mainshaft). A
correctly set up tapered roller bearing
should be very tight. When you think your
measurement is between .0005” – .002”,
try spinning the main drive gear. If it spins
freely with no drag and no excessive
noise, setup is complete and you may
proceed to the next step.
7. Remove the tooling used to install the main drive gear along with pulley spacer if you had
to use it. If necessary, reinstall the O-ring (OR568M52) that you removed from the pulley
spacer in step 3.
IF YOUR SETUP IS TOO TIGHT (UNDER .0005”), REMOVE THE MAIN DRIVE
GEAR FROM THE CASE USING THE PROPER TOOLING. REMOVE THE O-RING
FROM THE ‘SNOUT’ OF THE MAIN DRIVE GEAR FOLLOWED BY THE .104”
(GREEN) SPACER. INSTALL THE .106” (BLUE) SPACER, REPLACE THE O-RING,
AND GO BACK TO STEP 4.
IF YOUR SETUP IS TOO LOOSE (OVER .002”), REMOVE THE MAIN DRIVE GEAR
FROM THE CASE USING THE PROPER TOOLING. REMOVE THE O-RING FROM
THE ‘SNOUT’ OF THE MAIN DRIVE GEAR FOLLOWED BY THE .104” (GREEN)
SPACER. INSTALL THE .102” (WHITE) SPACER, REPLACE THE O-RING, AND
GO BACK TO STEP 4.
Watch Class #4 on the BAKER
Drivetrain YouTube channel for
a video tutorial on setting up
end play in the main drive gear
bearing.
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FIGURE 22 | INSTALLING THE PULLEY
SPACER AND THE MAIN DRIVE GEAR SEAL
FIGURE 23 | MAIN DRIVE GEAR SEAL
INSTALLED FLUSH WITH CASE
INSTALLING THE MAIN DRIVE GEAR
8. Put some transmission fluid on the
outer diameter and O-ring of the pulley
spacer. Install it onto the main drive
gear with the O-ring facing inward
(toward the bearing); see figure 22.
9. Put some transmission fluid on the lip
of the main drive gear seal and install
it. Make sure the seal is flush with the
transmission case all the way around
the bearing boss; see figure 23.
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FIGURE 24 | LEAVE THE ZIP TIE ON THE SHIFTER
PAWL UNTIL AFTER THE GEARSET IS INSTALLED
AND THE BOLTS ARE TORQUED
FIGURE 25 | GRUDGEBOX GEARSET READY
FOR INSTALLATION INTO THE CASE
SHIFTER PAWL INSTALLATION
GEARSET INSTALLATION
INSTALLING THE GEARSET
1. If you removed the stock centering pin
to clean the case, reinstall it with red
threadlocker. Install the GrudgeBox
shifter pawl along with the new seal,
washer, and 7/16” retaining ring just like
a stock shifter pawl is installed. Do not
remove the zip tie because it is placed
on the pawl to keep the active plate
retracted during gearset installation into
the case; see figure 24.
2. The time has come to stuff the gearset
(figure 25) into the transmission case.
Before that is done, take time to ensure
no debris or tarantulas have found their
way into the case. Check that the two
bearing door dowels came out of the
case with old bearing door. Locate the
new bearing door gasket onto the
dowels of the GrudgeBox bearing door.
Generously apply transmission lube to
the last 6” of the mainshaft, end of the
countershaft, countershaft bearing,
tapered roller bearings, and the
bearings/seal in the main drive gear.
Do not remove the black rubber cap
from the end of the mainshaft. Its
function is to protect the seal in the
main drive gear as the gearset is
installed.
PV4-118310
PAGE 22
FIGURE 26 | TORQUE SEQUENCE FOR
GRUDGEBOX BEARING DOOR BOLTS
TRANSMISSION FLUID
3. Carefully install the gearset into the
transmission case. It is helpful to have a
second set of hands on the left side of the
motorcycle to grab onto the mainshaft as
it passes through the main drive gear.
The person on the left side can help the
process along by gently rotating the main
drive gear back and forth; this helps the
5th gear on the countershaft find home
with the main drive gear.
It is rare, but sometimes the fork rods
need to be jostled to find home on the left
side of the transmission case.
4. Install the eight stainless steel cap screws and washers (rounded side down) onto the
bearing door using blue threadlocker. Be sure to replace the exhaust bracket beneath the
bottom inner bolts. Torque to 22 – 25 ft-lb using the torque sequence in figure 26. You
may remove the zip tie from the shifter pawl and the black rubber cap from the mainshaft
at this time.
INSTALLING THE GEARSET
8. Put 28-32 oz. transmission fluid (75-85W140 synthetic gear oil) into the transmission by
pouring it through the top cover cavity onto the main drive gear and shifter pawl. Make
sure to coat as much of the gearset components as possible with the fluid.
6. With the new side cover gasket in place, re-install the side cover and torque the bolts to
125 – 135 in-lb with blue threadlocker. Go to the other side of the motorcycle and re-install
the drive pulley or sprocket onto the main drive gear. Use BAKER TOOLD-07 or H-D
equivalent to torque the pulley / sprocket nut to 35 ft-lb + 35° – 45° with red threadlocker.
Refer to your Factory Service Manual for details.
7. Re-install the transmission drain plug and torque it to 14 – 21 ft-lb. Re-install the transmission
dipstick and torque it to 25 – 75 in-lb.
5. Locate the speed sensor that was removed from the transmission case during stock
component removal. Remove the O-ring from the speed sensor, install the provided spacer
(132-56R), and re-install the O-ring. The speed sensor with spacer can now be placed
back into the transmission case. Torque the bolt to 125 – 135 in-lb with blue threadlocker.
PV4-118310
PAGE 23
FINAL STEPS
SPEEDOMETER, GEAR INDICATOR, & CRUISE CONTROL
The GrudgeBox has different gear ratios than the stock transmission (except GrudgeBox 5th
gear is the same as stock 6th gear, 1:1). This changes the input to the ECM. The 41-tooth
reluctor ring in the GrudgeBox compensates to correct the speedometer within ± 2 mph with
no re-flash to the ECM. However, the gear indicator and cruise control may only operate in 5th
gear. To correct the gear indicator in all gears and enable cruise control in 3rd, 4th, and 6th, an
ECM re-flash is required.
ECM RE-FLASH VALUES
1. Re-install the top cover with the new gasket provided. Button up the primary, exhaust, shift
linkage, and floorboards/footpegs per your Factory Service Manual. Make sure to re-install
the primary drain plug and fill the primary with fluid.
2. You have successfully completed the installation of your new transmission. Be observant
of basic transmission function and overall vehicle operation during the first 20 miles.
Check for leaks after your first ride. Provided there are no issues, ride on and enjoy your
new BAKER GrudgeBox.
FINISH LINE
GrudgeBox | Dynojet Power Vision
1st – 0.15441
2nd – 0.22296
3rd – 0.30560
4th – 0.38679
5th – 0.49366
6th – 0.53426
PV4-118310
PAGE 24
WIRING DIAGRAM FOR IGNITION KILL SHIFT DRUMS
PV4-118310
PAGE 25
ORDERS
Orders can be pre-paid using VISA, MasterCard, American Express, and Discover or via wire transfer ($30 wire transfer fee applies).
All orders not pre-paid will be sent C.O.D. certified check or money order only unless pre-approved for company check acceptance.
Any orders from outside the USA must be pre-paid in US funds via wire transfer ($30 transfer fee applies).
Prices shown are F.O.B. Haslett, MI. BAKER™ ships via UPS Ground or USPS Parcel Post for all orders. UPS air shipment or USPS
Priority/ Express services are available upon request. Customer is responsible for all shipping charges unless otherwise arranged at
the time of sale.
CUSTOMER SUPPORT
For any installation or service questions, please contact our BAKER technical department: 1-517-339-3835.
LIMITED WARRANTY
BAKER™ transmission assemblies, transmission kits, primaries, and oil pans are guaranteed to the original purchaser to be free of
manufacturing defects in materials and workmanship for a period of 5 years from the date of purchase or up to 50,000 miles. BAKER™
clutches, kicker cover kits, belt drives, F6F kit, reverse systems, covers and accessories are guaranteed to the original purchaser to
be free of manufacturing defects in materials and workmanship for a period of 2 years from the date of purchase or up to 24,000 miles.
Electrical components are guaranteed for 90 days, chrome finish is guaranteed for 6 months.
If the product is found by BAKER™ to be defective, such products will, at the option of BAKER™, be replaced or repaired at cost to
BAKER™.
In the event warranty service is required, the original purchaser must call or write BAKER™ immediately with the problem. If it is
deemed necessary for BAKER™ to make an evaluation to determine whether the transmission assembly or transmission kit is
defective, the entire transmission assembly, whether originally purchased as an assembly or kit, must be properly packaged and
returned prepaid to BAKER™ with a copy of the original invoice of purchase. If after an evaluation has been made by BAKER™ and
a defect in materials and/or workmanship is found, BAKER™ will, at BAKER™ option, repair or replace the defective part of the
assembly.
BAKER Warranty card must be returned within 45 days of purchase to be valid.
RETURNS AND EXCHANGES
Any merchandise returned for any reason (exchange, credit or modification) must be accompanied by a Returned Goods
Authorization (RGA) number or it will be refused. Call BAKER™ to obtain this number prior to returning goods for any reason.
There is a 15% restocking fee for all returned items. BAKER™ is not liable for any shipping changes or damages incurred during
shipping. Shipments of returned goods must be insured by the customer.
ADDITIONAL WARRANTY PROVISIONS
NOTE: This limited warranty does not cover labor or other costs or expenses incidental to the repair and or replacement of BAKER™
products. This warranty does not apply if one or more of the following situations is judged by BAKER™ to be relevant: improper
installation, accident, modification (including but not limited to use of unauthorized parts), racing, high performance application,
mishandling, misapplication, neglect (including but not limited to improper maintenance), or improper repair.
BAKER™ shall not be liable for any consequential or incidental damages arising out of or in connection with a BAKER™ transmission
assembly, transmission kit, swingarm, fender, component or part. Consequential damages shall include without limitation, loss of use,
income or profit, or losses sustained as the result of injury (including death) to any person or loss of or damage to property.
BAKER™ transmissions, transmission kits, and accessories are designed exclusively for use in American V-Twin motorcycles.
BAKER™ shall have no warranty or liability obligation if a BAKER™ part is used in any other application.
If it is determined that a BAKER™ transmission assembly has been disassembled during the warranty period for any reason, this
limited warranty will no longer apply unless you were instructed to do so by a BAKER Drivetrain technician for diagnostic purposes.
DISCLAIMER
The words Harley and H-D are registered trademarks and are for reference only. Use of H-D model designations and part numbers
are for reference only. BAKER Drivetrain has no association with, and makes no claim against, these words, trademarks, or
companies.
It is the sole responsibility of the user to determine the suitability of this product for his or her use, and the user shall assume all legal,
personal injury risk and liability and all other as well as all other obligations, duties and risks associated therewith.
TERMS & CONDITIONS
PV4-118310
PAGE 26
DATE ODOMETER OIL USED SERVICED BY
500
2,500
7,500
12,500
17,500
22,500
27,500
32,500
37,500
42,500
47,500
52,500
57,500
62,500
67,500
72,500
77,500
82,500
87,500
92,500
TRANSMISSION OIL CHANGE LOG
PV4-118310
PAGE 27
DATE ODOMETER WORK PERFORMED SERVICED BY
GENERAL MAINTENANCE LOG
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