EXPERTEC TSB (87-T-76)

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

HARSH OR FIRM 2-3 UPSHIFTS - DIAGNOSIS AND REPAIR

Model(s): 1986 (S.R.T.A.) or 1987 44OT4/Hydra-Matic 4T60 equipped

Cutlass Ciera, Eighty-eight, Ninety-eight, and Toronado with 3.8L (RPO - LG3) Engine

Bulletin No.: Oldsmobile 87-T-76

Date: 03/02/1989

BULLETIN ILLUSTRATION LIST

BULLETIN COVERS

A harsh or firm 2-3 upshift that may occur most noticeably under 1/2 throttle acceleration on some 1986 SRTA models and 1987 Cutlass Ciera, Eighty-Eight, Ninety-Eight and Toronado models equipped with a 3.8L and THM 440-T4/HYDRA-MATIC 4T60 transaxle. This condition can be corrected by following the procedure listed under "Service Action".

SERVICE ACTION

1. Verify correct minimum and maximum pressures.
2. Check for vacuum leaks and/or a low vacuum supply to the vacuum modulator.
   NOTE: Required vacuum is 44-61 KPA (13-18 in. Hg.). The vacuum signal should respond quickly to throttle movement; if not, check for anything that could cause a vacuum restriction to the modulator causing a delayed response to throttle movement, like paint in the modulator tube and/or carbon at the throttle body fitting.
3. Remove the 3-4 M.T.V. Bushing (338), 2-3 Accumulator Valve (337), then the 2-3 Accumulator Spring (336) as shown in Fig. 2. install the 2-3 Accumulator Spring (336) from the appropriate service package shown in the "Service Parts Information" section.
   NOTE: While the transaxle is disassembled, check the items listed below that affect transaxle operation which may also contribute to the harsh shift condition.
   • #7 Check Ball and Capsule for leaks.
   • 1 -2 Servo Pipe for leaks.
   • 1 -2 Servo for - seal damage or binding.
   • #12 Check Ball missing, or mislocated.
   • Spacer Plate for peening from Check Balls #4 and #12.

SERVICE PARTS INFORMATION

Transaxle Model Identification (Fig. Fig 1 )	2-3 Accumulator Spring Package Number	Contents
6FBH, 7FBH, 7FKH	8662972	(1) Spring, 2-3 Accumulalor (2) Spacer Plate Gaskets (1) Instruction Sheet
6FCH, 6FZH 7FCH, 7FZH	8662973	(1) Spring, 2-3 Accumulator (2) Spacer Plate Gaskets (1) Instruction Sheet
6FTH, 6FYH 7FNH, 7FRH, 7FTH	8662977	(1) Spring, 2-3 Accumulator (2) Spacer Plate Gaskets (1) instruction Sheet

Parts are currently avallable from GMSPO.

SERVICE MANUAL REFERENCE

Refer to the appropriate 1986 or 1987 Service Information Manual, Section 7Al Automatic Transaxle On Car Service and THM 440-T4/HYDRA-MATIC 4T60 (ME9) Automatic Transaxle Unit Repair Table of Contents for Control Valve Assembly service information,