REV. ACCUMULATOR BUSHING AND RETAIN CLIP/CONV. CLUTCH REG.

Subject: REVISED ACCUMULATOR BUSHING AND RETAINING CLIP/CONVERTER CLUTCH REGULATOR LINE-UP (INFORMATION)

MODELS AFFECTED: 1993 BONNEVILLE, GRAND PRIX AND TRANS SPORT MODELS

TRANSMISSION APPLICATIONS: 1993 HYDRA-MATIC 4T60-E (RPO M13)

SUBJECT: ------- *Revised Accumulator Bushing and Retaining Clip *Revised Converter Clutch Regulator Line-up (General Information)

TRANSMISSION MODELS: All

BULLETIN COVERS:

A redesigned accumulator bushing and accumulator bushing retainer clip has been released for all 1993 HYDRA-MATIC 4T60-E (RPO M13) transaxles. The redesign has improved the "holding" capacity of the accumulator bushing by increasing the bushing retainer window to accommodate a more robust retainer clip (380).

Also, a new design has been released for 1993 on the 4T60-E transaxle "Converter Clutch Regulator" line-up (Figure 2). The new design has eliminated the valve bore plug (329) and spring clip retainer (314), and replaced them with a converter clutch regulator bushing (384). The bushing is secured in place with converter clutch retainer (383), which was previously retainer (337).

DATE OF PRODUCTION CHANGE:

The revised accumulator bushings and accumulator bushing retainers will be implemented into production at the start of the 1993 Model Year (SVP 93). When servicing prior 4T60-E transaxle models (1991 and 1992), it is essential that the old (prior) accumulator bushings and accumulator bushing retainers be used (THE OLD AND NEW ACCUMULATOR BUSHINGS AND RETAINERS ARE NOT INTERCHANGEABLE).

SERVICE PART INFORMATION:

PART DESCRIPTION ILLUSTRATION (1992 AND 1992 MODEL YEARS) NUMBER --------------------------- ------------ BUSHING, 1-2 ACCUMULATOR VALVE (PRIMARY) 342 BUSHING, 2-3 ACCUMULATOR VALVE 345 BUSHING, 1-2 ACCUMULATOR (SECONDARY) 349 BUSHING, 3-4 ACCUMULATOR VALVE 352 RETAINER, ACCUMULATOR BUSHING ASM. 337 RETAINER, SPRING CLIP 328 PLUG, VALVE BORE 329 VALVE BODY MACHINED 301

NEW PART DESCRIPTION ILLUSTRATION (1993 MODEL YEAR) NUMBER -------------------- ------------ BUSHING 1-2 ACCUMULATOR VALVE (PRIMARY) 342 BUSHING, 2-3 ACCUMULATOR VALVE 345 BUSHING, 1-2 ACCUMULATOR (SECONDARY) 349 BUSHING, 3-4 ACCUMULATOR VALVE 352 RETAINER, CONVERTER CLUTCH REGULATOR 383 BUSHING, CONVERTER CLUTCH REGULATOR 384 VALVE BODY MACHINED 301

Parts are currently available through 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.