TCC BUSYNESS CAUSED BY EARLY 3-4 SHIFT/3-4 VALVE SPRING P/N

MODELS/YEARS: 1986 DELTA 88 AND NINETY-EIGHT MODELS EQUIPPED WITH 3.0L OR 3.8 SHIFT ENGINES AND 440-T4 (ME9) TRANSAXLE

1986 Transaxle Model Codes:

6BAH, 6BBH, 6BDH, 6BHH, 6BLH, 6BMH

BULLETIN COVERS:

Torque converter clutch (TCC) busyness caused by an early 3-4 shift in 1986 Delta 88 and Ninety-Eight models, equipped with a 3.0L or 3.8L engine and THM 440-T4 transaxle, may be repaired by replacing the 3-4 throule valve (T.V.) spring. Under light throttle, TCC releases during the shift raising engine r.p.m. momentarily (may be diagnosed as an engine flare), then TCC re-applies shortly after the shift is completed.

DATE OF PRODUCTION CHANGE:

Start of Production for all 1987 THM 440-T4 transaxles have the new calibration and are not affected.

SERVICE ACTION:

Inspect and adjust the T.V. cable following the procedures contained in the appropriate Service Manual and road test the vehicle. If the condition still exists, replace the 3-4 T.V. spring (Item No. 348, Figure 1) contained in the service package described in the "Service Parts Information" section.

SERVICE PARTS INFORMATION:

Service Package No. Contents ------------------- -------- 8662934 (1) 3-4 Throttle Valve Spring (2) Spacer Plate Gaskets (1) Instruction Sheet

SERVICE MANUAL REFERENCE:

Refer to the On-Car Service section and the THM 440-T4 Transaxle Unit Repair section in the appropriate model year service manual for repair procedures.

WARRANTY INFORMATION

Labor Operation Number: T4621 Labor Time: 3.1 hrs. Trouble Code: 92

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.