Skylark V6-204 3.3L VIN N FI (1989)
Band Apply Servo: All Technical Service Bulletins
A/T - No Second Gear
Bulletin
89-7125-3
Date
Jan., '89
Ref. No.
89-047-7125
Corp. Ref. No.
877149R
SUBJECT:
NO SECOND GEAR
MODELS AFFECTED:
1988-89 THM 125C/HYDRA-MATIC 3T40, CENTURY, SKYHAWK, SKYLARK
BULLETIN COVERS
A No Second Gear condition that may be caused by a rough surface finish on the Intermediate Servo Cover Piston Bore (137). This finish will wear the
lip off the (inner) Intermediate Servo Seal (132), causing a leak in the piston bore. This leak may cause Intermediate Band (606), and Direct Clutch (608
- 617) wear.
SERVICE ACTION
If a customer comments about a No Second Gear condition in any THM 125C/HYDRA-MATIC 3T40, the Intermediate Band and Direct Clutch
Assembly should be inspected for possible wear. To service this condition on a 1988 or 1989 125C/HYDRA-MATIC 3T40, inspect for a worn inner lip
seal and cover surface machine finish. If the finish is rough, install a new Intermediate Servo Cover and Intermediate Servo oil ring seals (inner and
outer).
SERVICE NOTES
Do not attempt to sand the intermediate servo cover bore machine finish with Crocus cloth, soft stone or any other smoothing material.
SERVICE PARTS INFORMATION
When ordering a new Intermediate Servo Cover and Intermediate Servo oil ring seals (inner and outer), refer to the following part list:
Intermediate Servo Piston and Seals
Intemediate Servo Cover
.79 Ratio - 8652901
.79 Ratio - 8631702
.71 Ratio - 8652900
.71 Ratio - 8631703
.64 Ratio - 8652911
.64 Ratio - 8631704
IMPORTANT:
Ratios listed are identifiers used in Service Parts Catalog for ordering purposes.
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE
When servicing any 125C/HYDRA-MATIC 3T40 refer to the procedures outlined in the Unit Repair Section of your Service Manual.
