B&M LIGHT TRUCK MEGASHIFTER User Manual
Installation Instructions
Light Truck Megashifter
Part Number 80680
©2010, 2006, 2000 by B&M Racing & Performance Products
The B&M Light Truck Megashifter
shifter is designed to be used in most
light trucks equipped with most popular
three speed or four speed automatic
transmissions. Your B&M Megashifter
comes equipped with neutral safety and
backup light switches, transmission
brackets and levers and a five foot shift
cable. Optional shifter cables in 2
ft.(#80830), 3 ft.(#80831), 4 ft.(#80832), 8
ft.(#80834), 10 ft.(#80835) and 12 ft.
(#80836) are also available. To use the
B&M Light Truck Megashifter with the
Ford AOD transmissions you will need
the optional accessory kit #40496.To use
the B&M Light Truck Megashifter with
the GM 4L60E and 4L65E equipped with
a PRNDL switch you will need optional
accessory kit #75498 otherwise you can
use the GM bracket supplied.
This shifter has adjustable height
mounting brackets so that it can be installed at the best height for your truck.
Because the front and rear mounting
brackets can be adjusted separately, it
can also be install on an angled or sloping floor with the shifter mounted flat.
Please read the instructions and review the illustrations thoroughly before
beginning the installation.
The mechanical components of this
shifter are precision made and assembled at our factory. Any modification
or disassembly of these parts can cause
the shifter to malfunction and will void the
warranty. You should disassemble only
those items outlined in the instructions.
The vehicle should be about 2 feet off
the ground for ease of installation. Use
jack stands, wheel ramps or a vehicle lift.
Make sure the vehicle is firmly supported
before attempting to work on it.
IMPORTANT: If your vehicle is equipped
with a locking steering column, securing
the column lock lever in the engine compartment in the full up position will allow
the steering wheel to be locked and unlocked and the ignition key to be removed.
WARNING: This allows the steering wheel
to be locked WHENEVER the ignition key
is turned to the “lock” position WHILE
THE VEHICLE IS MOVING, OR AT ANY
OTHER TIME. Securing the steering column lock lever in any other position will
both PREVENT the steering wheel from
locking and the removal of the ignition
key.
INSTALLATION
NOTE: If you are installing this shifter with
a GM four speed automatic transmission, you must remove the blocker pin
and the two e-clips indicated in Figures
1 and 3. Removing this blocker pin gives
the shifter four forward positions rather
than three. For Ford AOD four speed
transmissions do not remove this blocker
pin and the two e-clips, since this transmission has only three forward positions. Also do not remove the blocker pin
and the two e-clips for three speed automatic transmissions.
STEP 1. Locate the shifter on the floor of
the truck where you want it to be located.
The mounting brackets can mount the
basic shifter assembly 1-1/2" to 3-5/8"
above the floor. Figure 2 gives the dimension of the shifter, so be sure that there is
enough room where you will be mounting the shifter.
STEP 2. Remove the stock shift linkage;
Column Shifters: Remove all rods, le-
vers or cables from the column and the
transmission. Place the column shift lever in the Park position. Remove the pin
holding the shift lever in the column and
remove the lever assembly. If your vehicle is equipped with a locking steering
column, secure the column lock lever in
the full up position. WARNING: This allows the steering wheel to be locked and
the ignition key removed WHENEVER the
ignition key is turned to the Lock position
WHILE THE VEHICLE IS MOVING, OR AT
ANY OTHER TIME.
Console Shifters: Remove the shifter
mechanism from the console. Disconnect the rod or the cable from the transmission. Remove the cable bracket if
equipped. If there is a cable or linkage
from the console shifter or the transmission to the steering column lock, it must
be blocked in the Park position as described above.
NOTE: The shifter installation may require console modification or complete
console removal depending on the space
available in your vehicle.
STEP 3. Assemble the mounting
bracket as shown in Figure 1. Be sure
that the end plate with the wide slot on top
is to the front and that the top plate has the
three holes at the front. Assemble the
bracket with the four 1/4-20 x 3/4" screws
finger tight. Put flat washers on both sides
of the brackets and a lock washer under
the nut.
Pull the carpet away from the floorboard where the shifter mounting bracket
is to be located. Place the shifter on the
mounting bracket and slide the front and
rear brackets up or down to get the desired height for the shifter. Tighten the
four screws on the bracket. If the vehicle
has a bench type seat, move the seat to
the full forward position. With the stick
shifted to the rearmost gate position.
Locate the shifter for ease and convenience of operation (See Figure 2). Make
sure the trigger and the T-handle clear
the dash with the shifter in the Park position. Mark the position of four mounting
holes for the bracket assembly on the
floor.
STEP 4. Drill four 9/32" mounting holes
where marked. Temporarily mount the
shifter to the mounting bracket and bolt
the bracket to the floor. If the floor is not
flat, bend the tabs at the end of the front
and rear bracket. Mark the location for the
shifter cable hole in the floor. The hole will
be 1" inboard of the left front mounting
bracket to floor bolt and between 2-1/2"
Printed in U.S.A.
9500512-06
Cover plate
Tower
1/4" nut and
lockwasher
Cable attaching tab
goes on outside surface of shifter base
1/4-20 x 1/2"
screw
E-Clip
Mounting
base
1/4-20 x 3/4"
screw with flat
washer and lock
Boot
#4-40 x 1-1/4
screws, nuts and
lock washers
washer
Cable pin
Figure 1
10-32 x 3/4"
Pan head
10-24 x 1/2'
flat head
Remove this
blocker pin and
the two e-clips
GM four speed
transmissions
Backup light
switch
Neutral safety
switch
Locking
holes
1/4-20 x 1-1/2
full thread
screws
1/4-20 x 3/4"
screw with 2
flat washers
and lock
washer
2
for
and 3-1/2" ahead of this bolt. (The hole
will be 3-1/2" ahead if the bracket is at
maximum height and 2-1/2" ahead if the
bracket is adjusted to minimum height.
Drill or cut a 1-1/2" diameter cable hole in
the floorboard. NOTE: Some floorboards
are extremely thin and will not adequately
support the shifter mechanism when
bolted to the floor. For those vehicles we
recommend that you fabricate a stiffener
plate for additional strength.
STEP 5. Remove the mounting bracket
assembly. Tighten the four screws securely. At each end, drill a 1/4" hole through
one of the locking holes in each end of the
bracket into the top plate. Put a 1/4" screw
and a lock washer into each of these
holes to lock the bracket together. Attach
the shifter to the mounting bracket with
four 1/4-20 X 3/4" screws and lock washers.
STEP 6. Install (but do not secure) the
carpet back to it’s original position. Cut
holes in the carpet for the mounting holes
and cable. DO NOT use a drill bit to make
the holes in carpet.
STEP 7. Assemble neutral safety and
reverse light switches to the bracket using two #4-40 x 1" screws and nuts, as
shown in Figure 1. Beware, over tighten-
ing the switch attachment screws will
crack the switch housings. Install the
switch assembly on the shifter. To adjust
the switches, loosen the screws and
slide the switches in or out as required,
then retighten the screws.
STEP 8. Install the cable on the shifter
as shown in Figure 1. The cable attachment tab should be bolted to the outside
surface of the shifter base using a 1/4" x
1/2" hex screw, lock washer and nut.
Install the e-clip that secures the cable to
the cable pin.
STEP 9. Just before the final installation
of the shifter in the vehicle, attach the
indicator cable to the side of the shifter as
shown in Figure 3. The indicator cable
bracket is secured to the shifter mechanism with two #6 x 3/4" sheet metal
screws and #6 washers, the eyelet on the
end of the indicator cable is secured to
the cable pin by a supplied small e-clip.
STEP 10.Install the shifter mechanism
into the vehicle. Slide the shifter cable
through the carpet and the hole in floor.
Bolt the shifter down using four 1/4-20 x
1-1/2" full thread hex screws, nuts, lock
washers and flat washers. If the mounting bracket does not sit flat of the floor, the
tabs at the end of the mounting bracket
can be bent so that they will fit the floor.
ROUTE THE CABLE AS SHOWN IN FIGURE 4, AVOID SHARP BENDS WHICH
WILL KINK AND DAMAGE THE CABLE.
Use cable clamps or tie wraps to secure
the cable housing to the chassis to avoid
contact with hot engine or exhaust system.
STEP 11.Seal the hole where the cable
goes through the floorboards to prevent
air or water leakage. A putty type sealer
can be used. For General Motors vehicles go to Step 12, for Ford vehicles got
to Step 17, for Chrysler vehicles go to
Step 23.
GENERAL MOTORS
STEP 10.If you have not already done so,
remove the stock selector lever nut and
the selector lever from the transmission.
Discard the stock lever and the stock
shifter linkage. Install the B&M selector
lever in position using the stock selector
lever nut (See Figure 5). Torque the nut to
23 lb.ft. The lever should move smoothly
from front to rear with a positive click in
each gear position.
STEP 11.Remove the two transmission
oil pan bolts from the middle of the left
side of the oil pan. Install the cable bracket
in position (See Figure 5). The bracket
must be installed with two spacers between the pan and the bracket. (If your
transmission is equipped with a cast
aluminum oil pan, these spacers should
be omitted. With a TH-400 with a cast
aluminum oil pan the cable bracket may
have to be modified.) Install the two 5/1618 x 1.00" bolts (Metric transmissions
use the two 8mm x 25mm bolts) supplied
and tighten to 12-13 lb.ft. Do not overtighten as this can damage the pan gasket.
STEP 12.Route the shifter cable according to Figure 4. Avoid kinks and sharp
bends and route the cable away from hot
engine or exhaust parts.
Remove the two rubber boots, one
large nut, and a large lockwas her from
the threaded end of the shifter cable.
Figure 2
Slide the end of the cable into the cable
bracket. Install the large nut and the
lockwasher loosely over the end of the
cable. Install the two rubber boots onto
the end of the cable. Install the swivel on
the threaded end of the cable and position it in the center of the threaded portion.
STEP 13.Move the transmission selector lever by hand to full rear position
(Low). Operate the shifter lever to the Low
gear position (ratcheted all the way back).
Adjust the large nuts on the cable so that
the swivel will slide into the front hole on
the selector lever. Tighten the large nuts
completely. Be sure that the swivel will
slide freely in and out of the hole in the
Remove this blocker pin
and the two e-clips for GM
four speed transmissions
Washer (2)
Bracket
Figure 3
selector lever. Note: The shifter will not
operate correctly unless the front hole
in the shift lever is used.
Leave the swivel out of the hole and
move the selector lever to Park, all the
way forward. Also move the shifter to the
Park position (all the way forward). Reinsert the swivel into the front hole in the
selector lever. Check to see that the swivel
will slide freely in and out of the front hole
in the selector lever in this position. If it
does not slip in freely, adjust the swivel
slightly until it will slip into the hole in the
lever.
Move the shifter back to the Low gear
position and check that the swivel will still
E-Clip
Indicator
cable
Sheet metal
screw (2)
3
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