1995 - 1996 Corvette: Service Bulletin: Delayed Engagement (Replace Pump Cover Assembly)

Subject: Delayed Engagement (Replace Pump Cover Assembly)
Model and Year:
1995-96 BUICK ROADMASTER
1995-96 CADILLAC FLEETWOOD
1995-96 CHEVROLET CAPRICE, CAMARO, CORVETTE
1995-96 HOLDEN COMMODORE (VR AND VS)
1995-96 PONTIAC FIREBIRD
1995-96 CHEVROLET AND GMC C/K, M/L, S/T, G MODELS
1996 OLDSMOBILE BRAVADA WITH HYDRA-MATIC 4L60-E (RPO M30)

Source: Chevrolet Dealer Service Bulletin
Bulletin Number: 67-71-48

**IMPORTANT: CANADIAN DEALERS SHOULD REPAIR TRANSMISSIONS FOLLOWING ESTABLISHED REPAIR PRACTICES.

CONDITION:

(FIGURES 1 AND 2) SOME OWNERS OF THE ABOVE MODELS, WITH A HYDRA-MATIC 4L60-E TRANSMISSION (BUILT BEFORE APRIL 29, 1996/JULIAN DATE 6120), MAY EXPERIENCE SOME DELAYED ENGAGEMENT WHEN VEHICLE IS NOT USED FOR MORE THAN 48 HOURS.

CAUSE:

TORQUE CONVERTER FLUID LEVEL LOW DUE TO FLUID DRAIN DOWN.

CORRECTION:

(FIGURE 3) REPLACE PUMP COVER ASSEMBLY WITH THE NEW TCC SIGNAL VALVE ASSEMBLY.

SERVICE PARTS INFORMATION

NEW PART TRANSMISSION NUMBER DESCRIPTION MODELS -------- ----------- ------------ 24209049 PACKAGE-COVER ASSEMBLY, PUMP ALL 1995-96 MODELS EXCEPT THOSE LISTED BELOW.

24209050 PACKAGE-COVER ASSEMBLY, PUMP 5BWD,5FFD,5YDD,6CCD,6CFD, 6KBD,6CHD,6CJD,6KCD,6BWD, 6FFD,6YDD,6WBD,6WHD

PARTS ARE EXPECTED TO BE AVAILABLE ON JULY 1, 1996 FROM GMSPO.

FIGURE 1. - HYDRA-MATIC 4L60-E TRANSMISSION IDENTIFICATION INFORMATION

FIGURE 2. - HYDRA-MATIC 4L60-E TRANSMISSION IDENTIFICATION INFORMATION FOR TWO-PIECE CASE

FIGURE 3. - TORQUE CONVERTER CLUTCH SIGNAL VALVE ASSEMBLY LOCATION

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.