A/T - Harsh 1st-2nd Gear Up Shift

NUMBER: 92-T-137

CORP.REF.NO: 277135

DATE: October 1992

SECTION: 7, 4L60

SUBJECT:
HARSH 1-2 UPSHIFT
- INSTALL SERVICE PACKAGE

MODELS/YEARS:
1992 CUSTOM CRUISER, BRAVADA

CONDITION:
Some vehicles equipped with a 1992 HYDRA-MATIC 4L60 transmission built between Julian Date 061 (March 1, 1992) and Julian Date 171 (June 19, 1992) may exhibit a harsh 1-2 upshift.

Note:
Once the transmission is brought to operating temperature, the condition may not be able to be reproduced until a "cold soak" (overnight) is performed. This correction is not intended to modify a firm 1-2 shift on vehicles equipped with towing packages (RPO U92).

CAUSE:
The above condition may be caused due to a tapered 1-2 accumulator sleeve. The tapered bore may cause the 1-2 accumulator valve to stick in the bottom of the bore.

CORRECTION:
To improve the 1-2 shift, install the appropriate service package listed below. A 1-2 accumulator valve and 1-2 accumulator valve sleeve (which, normally, is not serviceable) is included in the package.





PARTS INFORMATION

Parts are currently available from GMSPO.