A/T - Slips In Low/Reverse-No Reverse

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Bulletin No.: T-92-114
File in Group: 7
Number: 240
Corp. Ref. No.: 277123
Date: July, 1992


SUBJECT:
SLIPS IN LOW/REVERSE-NO REVERSE (DIAGNOSE/REPLACE
LOW/REVERSE CLUTCH)

MODELS AFFECTED:
1986-1988 CIMARRONS


Some 1986-1988 Cimarrons equipped with Hydra-Matic 3T40 transaxles may exhibit symptoms associated with wear in the low/reverse clutch pack. These symptoms are:

^ Transaxle plips in manual low or reverse gears
^ Transaxle inoperative in reverse gear





Cause (Refer to 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 over travel, this over travel could possibly cause flattening of the low/reverse release spring (655) and deflection of the low/reverse clutch spring retainer (656).

Correction:

Proper diagnosis for either of the above symptoms should be performed prior to attempted repair for any condition. Diagnosis should include checking:

^ Fluid levels
^ TV cable adjustment
^ Fluid pressure
^ 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 support Teflon seals
^ Direct clutch seal

If the above diagnosis is performed and further repair is required, install the low/reverse clutch components listed below. Include the replacement of the low/reverse release spring (655), clutch spring retainer (656), and piston snap ring (657) as part of total repair. Refer to 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 (656/657) 8664961

These service packages are currently available from GMSPO.

Refer to the "Automatic Transaxle Diagnosis/Unit Repair" Section of your Service Information Manual for necessary low/reverse clutch diagnostic and repair information.

For warranty purposes use Labor Operation K7580 at 6.1 hours with any necessary additions.