Installation Instructions
Megashifter
Part Number 80690
©2010, 2006, 2000 by B&M Racing & Performance Products
The B&M Megashifter shifter can be used in vehicles 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 Megashifter with the Ford AOD transmissions you will need the optional accessory kit #40496. To use the B&M Megashifter with a GM 4L60E or 4L65E transmission equipped with a PRNDL switch you will need the optional accessory kit #75498 otherwise you can use the GM bracket supplied.
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 removal of the ignition key.
INSTALLATION
NOTE: If you are installing this shifter with a 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. Remove the stock shift linkage;
Column Shifters: Remove all rods, levers 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 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: Shifter installation may require console modification or complete console removal depending on the space available in your vehicle.
STEP 2. Pull the carpet away from the floorboard where the shifter is to be mounted. If the vehicle has a bench type seat, move the seat to the full forward position. Place the shifter on the floor 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 T-handle clear the dash with the shifter in the Park position. Mark the position of four mounting holes on the floor.
STEP 3. Drill four 9/32" mounting holes where marked. Temporarily mount the shifter in place using washers as required to get it level. Do not bend the mounting brackets on the bottom of the shifter. Mark the location for the shifter cable hole, 3" ahead of the left front shifter mounting hole. 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.
Printed in U.S.A. |
9500418-09 |
Boot
Cover plate
Tower
Cable pin
1/4" nut 1/4" lockwasher
1/4" x 1/2" bolt
Remove this blocker pin and the two e-clips for GM four speed transmissions
E-Clip |
Backup light |
|
switch |
Cable attaching tab goes on |
Neutral safety |
outside surface of shifter base |
switch |
Figure 1 |
|
STEP 4. Install (but do not secure) the carpet back to it’s original position. Cut holes in the carpet for the mounting holes and the cable. DO NOT use a drill bit to make holes in the carpet. STEP 5. Assemble the neutral safety and the reverse light switches to the bracket using two #4-40 x 1" screws and nuts, as shown in Figure 1. Beware, over tightening 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 6. 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 bolt, lock washer and nut. Install the e-clip that secures the cable to the cable pin.
STEP 7. 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 two #6 washers, the eyelet on the end of the indicator cable is secured to the cable pin by a supplied small e-clip.
STEP 8. Install the shifter mechanism into the vehicle. Slide the shifter cable through the carpet and the hole in the floor. Bolt the shifter down using four 1/ 4" x 1-1/2" hex bolts and nuts. If required use 1/4" washers as shims between the shifter mechanism and the floor to level the shifter. 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 9. 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 10, for Ford vehicles go to Step 15, for Chrysler vehicles go to Step 21.
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 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 5/16-18 x 1.00" bolts (Metric transmissions use the two 8mm x 25mm bolts) supplied and tighten 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 lock washer from
2
7.50"
1.00"
11.75"
TRIM AS
REQUIRED
the threaded end of the shifter cable. 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 the full rear position (Low). Operate the shifter lever to the Low gear position (ratcheted
Figure 2
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 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 slide easily in and out of the front hole in the selector lever. (If you do not use the front hole in the lever, it will be impossible to correctly adjust
Remove this blocker pin and the two e- clips for GM four speed transmissions
E-Clip
Indicator
cable
Washer (2) 
Bracket |
Sheet metal |
||
|
screw (2) |
||
Figure 3 |
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|
Figure 4 |
3
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