NEW END PLAY SPEC. 4T60/4T60-E (INPUT CARRIER PINION GEAR)

Subject: REVISED END PLAY SPECIFICATION/INPUT AND REACTION CARRIER SERVICE ONLY

Models Affected: 1984-90 CELEBRITY WITH HMD 4T60 AUTOMATIC TRANSMISSION 1990-92 LUMINA WITH HMD 4T60 AUTOMATIC TRANSMISSION 1991-92 LUMINA (APV) WITH 4T60-E AUTOMATIC TRANSMISSION

TRANSMISSION APPLICATIONS: SUBJECT: 1984-92 HYDRA-MATIC 4T60 Revised End Play Specification 1991-92 HYDRA-MATIC 4T60-E and Input/Reaction Carrier Service Information

TRANSMISSION MODELS: VEHICLE APPLICATION: All 1984-92 A,W Car 1992 U-Van

Bulletin Covers:

The reaction carrier and input carrier pinion gear to carrier end play specification has been changed for service. Previous specification was 0.23 to 0.61mm (0.009 to 0.024 inches). The new specification is 0.23 to 0.77mm (0.009 to 0.030 inches).

Service Procedures: (Figure 1) ------------------------------ INSPECT:

1) Reaction carrier assembly for excess pinion gear end play 0.23 to 0.77mm (0.009 to 0.024 in) . Check with a feeler gage. Check pinion gear and internal gear teeth for damage.

2) Input carrier to reaction carrier lube dam for cracks or excess wear.

3) Input carrier for excess pinion gear end play 0.23 to 0.77mm (0.009 to 0.030 in) Check with feeler gage.

MEASURE:

--------- The distance between the carrier housing and closest pinion washer. If the distance exceeds 0.77mm (0.030 in), replace the carrier assembly (this specification pertains to both bronze to steel and steel to steel carrier applications).

IMPORTANT: DO NOT attempt to rebuild the input or reaction carrier. Attempts to do so could effect the durability of the transaxle.

New Input Carrier Build: (Figure 2) --------------------------------------- Double steel pinion washers have replaced the previously used bronze and steel washer combination used to space the pinion gear from the input carrier housing. The new double steel combination can service all models back to the 1984 SOP model year. Date Of Production Change:

The steel to steel input carrier assembly was implemented into production on both the 4T60 and 4T60-E transaxles during the week of April 15, 1991 (Julian Date 098).

Service Part Information:

Application Old Part No. New Part No. Description ----------- ------------ ------------ --------------- 4T60/4T60-E 8668580 8675372 Carrier Asm, Input

Parts are currently available from GMSPO.

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.