LSS V6-3.8L VIN K (1997)
Valve Body: Customer Interest
A/T - Harsh Garage Shift from Reverse to Drive
File In Section: 7 - Transmission
Bulletin No.: 77-71-60A
Date: September, 1997
Subject:
Harsh Garage Shift Reverse to Drive
(Install New Valve Body Spacer Plate and Reflash PCM)
Models:
1997 Buick Park Avenue, Riviera
1997 Oldsmobile LSS
1997 Pontiac Grand Prix, Bonneville SSEi with 3.8L Engine (VINs 1, K - RPOs L67, L36) and HYDRA-MATIC 4T65-E Transaxle (RPOs MN3, MN7)
This bulletin is being revised to correct a new calibration number. Please discard Corporate Bulletin Number 77-71-60 (Section 7 - Transmission).
Condition
Some customers of vehicles equipped with a Hydra-matic 4T65-E transaxle produced before December 16, 1996 may comment about a harsh garage
shift sometimes described as a delayed or harsh engagement from reverse to drive.
Cause
This condition may be due to a combination of valve body spacer plate orifice size and calibration of this shift maneuver.
Correction
The vehicle assembly plants started producing vehicles with transaxles that contain an enhanced garage shift package on December 16, 1996 to improve
the reverse to drive garage shift feel. In order to correct this 6ondition on a customer's vehicle produced prior to December 16, 1996 it will be necessary
to install a new valve body spacer plate which has an orifice size change and reflash the calibration in the PCM.
Service Information
Vehicles produced before December 16, 1996 did NOT have this updated garage shift package. When the assembly plant introduced this change they
changed the model numbers of the transaxle assemblies.
When servicing a 4T65-E transaxle for a harsh garage shift, it is important to note the model number and compare it to the chart below to verify if the
repair should be performed.
Original Model Number
Updated Model Number
Before December 1996
After December 1996
7FBB 8.8L (L67)
7BMB 3.8L (L67)
C/G CAR
C/G CAR
7FHB 3.8L (L36)
7BDB 3.8L (L36)
C/G CAR
C/G CAR
7XAB 3.8L (L67) W CAR
7HKB 3.8L (L67) W CAR
7YWB 3.8L (L67) H CAR
7MAB 3.8L (L67) H CAR
Parts Information
The following parts are currently available from GMSPO.
Part Number
Description
24210495
Garage Shift Package, includes new
valve body spacer plate and gaskets
