M/T - Fifth Gear Whine, Revised Shift Lever & Boot

Group Ref.: Transmission

Bulletin No.: 367201

Date: April, 1994

SUBJECT:
5TH GEAR WHINE (INSTALL REVISED SHIFT LEVER AND BOOT)

MODELS:
1989-93 CHEVROLET AND GMC S TRUCKS WITH 2.8L OR 2.5L ENGINE (RPOs LL2, L38, LN8) AND MANUAL TRANSMISSION

THIS BULLETIN IS BEING REVISED TO INCLUDE SERVICE PARTS INFORMATION AND TO UPDATE THE PROCEDURE.
PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE:

DIVISION BULLETIN NUMBER
CHEVROLET 93-172-7B
GMC TRUCK 93-7B-64
GM CANADA 93-7B-108

CONDITION:

Some owners may comment about a whine or a gear noise when the transmission is in the 5th gear position. The noise usually occurs at highway speeds.

CAUSE:

The audible noise is a result of the internal gearbox working noises being transferred and amplified through the shift lever.

CORRECTION:

To isolate the audible noise from being transferred into the interior of the truck, a revised shift lever and boot have been released.

SERVICE INFORMATION:





(Refer to Figure 1)

1. Remove the shift knob (5) and lock nut (6).

2. Remove screws (9) and retainer (10), if used.

3. Remove shift boot (8).

4. Remove the shift lever (7) and the lock nut (11). Hold the lock nut and unscrew the shift lever using the wrench slots (A).





5. Cut off the top, non-threaded, portion of the shifter stub shaft at the end of the threads (Figure 2).

IMPORTANT:
DO NOT LEAVE MORE THAN 10 MM MATERIAL ABOVE THE TOP THREAD.

6. Install the lock nut (11), do not tighten.

7. Install the revised shift lever (P/N 15965641) and tighten the lock nut (11) up against the shift lever to 47 N-m (35 lbs.ft.).

8. Install the shift boot (8).

9. Install the retainer (10) and screws (9), if used.

10. Install the lock nut (6) all the way on, do not tighten.

11. Screw the shift knob against the lock nut, back the shift knob off to align the shift pattern and tighten the lock nut against the knob.





Service Parts Information:





Warranty Information: