A/T - Slips In Low/Reverse or No Reverse
Number: 92-219-7ASection: 7A
Date: JUNE 1992
Corporate Bulletin No.: 277123
ASE No.: A2
Subject:
SLIPS IN LOW/REVERSE-NO REVERSE
Model and Year:
1986-90 CELEBRITY, 1986-92 CAVALIER, 1987-92 CORSICA AND BERETTA, 1990-92 LUMINA, 1990-92 LUMINA APV - ALL WITH 3T40 AUTOMATIC TRANSMISSION
TRANSAXLE APPLICATIONS:
1986-92 HYDRA-MATIC 3T40 TRANSAXLE (RPO MD9)
TRANSAXLE MODELS:
All
SUBJECT:
* Slips in Manual Low/Reverse
* No Reverse Repair Low/Reverse Clutch
VEHICLE APPLICATIONS:
A, J, L, W Cars and U Van
CONDITION:
Some A, J, L, W Cars and U Vans equipped with HYDRA-MATIC 3T40 transaxles and manufactured the model years 1986 through 1992 may exhibit symptoms associated with wear in the low/reverse clutch pack. These symptoms are:
* Transaxle slips in manual low or reverse gears
* Transaxle inoperative in reverse gear
CAUSE:
(see Figure 1) If this condition exists (and upon inspection of the low/reverse components), and it is noted that the piston outer lip seal is cut due to piston overtravel, this overtravel could possibly cause flattening of the low/reverse release spring (655) and deflection of the low/reverse clutch spring retainer (656).
CORRECTION:
Proper diagnostics for either of the above symptoms should be performed prior to attempted repair for any condition. Diagnosis should include:
* Check fluid levels
* T/V cable adjustment
* Fluid pressure check
* Manual valve secured
* Low/reverse pipe not bent; washer seal/O-ring secured; pipe brackets tight
* Low/reverse piston seals uncut and properly installed
* No loose retainers
* Cup plug seal properly installed (not cut)
* Backing plate in proper location
* Driven sprocket suppod Teflon seals
* Direct clutch seals
If the diagnostic conditions are met and further repair is required, both the below listed service parts should be replaced with the low/reverse c!utch components using Labor Code K7580. Include the replacement of the low/reverse release spring (655), clutch spring retainer (656), and piston snap ring (657) as part of total repair (see Figure 1).
SERVICE PARTS INFORMATION:
Service
Part Name / Service Package Package Number
Low/Reverse Clutch Release Spring (655) 8628222
Low/Reverse Clutch Retainer and Snap Ring 8664961
(656/657)
These service packages are currently available from GMSPO.
Use applicable Labor Time Guide for labor hours.
SERVICE MANUAL REFERENCE:
Refer to the "Automatic Transaxle Diagnosis/Unit Repair" section of your service manual for necessary low/reverse clutch diagnostic and repair information.