INFO. ON 4T65-E INTRODUCTION AND ON-VEHICLE SERVICE

Subject: 4T65-E Introduction and On-Vehicle Service ------------------------------------------

Models: 1997 Buick Park Avenue, Riviera 1997 Chevrolet Lumina, Monte Carlo 1997 Oldsmobile Eighty Eight, LSS 1997 Pontiac Bonneville SSEI, Grand Prix with 3.8L, 3.4L Engine (ViNs K, 1, X - RPOs L36, L67, LQ1) and HYDRA-MATIC 4T65-E Transaxle (RPOs MN3, MN7, M15)

HYDRA-MATIC 4T65-E Transaxle Product Introduction. The HYDRA-MATIC 4T65-E transaxle is a new four speed, front wheel drive, electronically controlled transaxle used in the models listed above.

Bulletin Contents

This bulletin contains the following information regarding the HYDRA-MATIC 4T65-E transaxle:

- HYDRA-MATIC 4T65-E service policy

- Goodwrench Service Replacement Transmission Assembly (SRTA) program information and transaxle core return policy

- Service parts information

- General service guidelines and unique 4T65-E transaxle features

Service Policy

The HYDRA-MATIC 4T65-E transaxle service policy is designed to provide valuable product information to General Motors Powertrain Group. The service policy for the 1997 production year is limited on-vehicle service. The components included for limited on-vehicle service are shown in Figure 1. All repairs which cannot be corrected with the components shown in Figure 1 must use a Goodwrench (SRTA) transaxle assembly for the repair. Limited on-vehicle service will remain in effect until start of production 1998 or until further notification.

Goodwrench SRTA Program Transaxle Returns

Goodwrench SRTA transmissions are the product of a highly successful customer satisfaction driven program that parallels the existing HYDRA-MATIC 3T40, 4T40-E, 4T60, 4T60-E, 4T80-E, 4L60, 4L60-E, and 4L80-E programs.

GMSPO Parts Distribution Centers are committed to a 48 hour maximum delivery time for all Goodwrench SRTA models with no VIP charges. (Ninety-six (96) hours for GM of Canada dealers.) The Goodwrench SRTA transaxle contains an information packet that includes Limited Warranty Information, Transaxle Core Exchange Return Procedure information, and a pre-addressed return mailing envelope (Figure 2).

It is important that the Product Feedback Form (Figure 3) be properly completed by the technician or service manager and include all diagnostic information. This information is essential for proper root cause analysis. Insert the white copy of the completed form and a copy of the repair order into the Goodwrench SRTA Information Packet envelope, seal the envelope and wire tag it to the bell housing of the unit being returned for transaxle core exchange. Return the yellow copy of the completed Product Feedback form, using the postage paid envelope, to GM Powertrain Group.

Transaxle Core Return Process

Dealers should expedite shipment of the transaxle core to the appropriate GMSPO Parts Distribution Center. A special return sticker will be attached to the transaxle core container. The dealer must add the appropriate dealer code information to the sticker to expedite the core return for root cause analysis at GM Powertrain. Parts Information Goodwrench SRTA Model

Parts Information

Goodwrench SRTA Model Replacement Chart

SRTA Part Number Model Description ---------------- ----- ---------------- 24207977 7FBB 3.8L L67 C/G Car 24207978 7FHB 3.8L L36 C/G Car 24207979 7XAB 3.8L L67 W Car 24207980 7YSB 3.4L LQ1 W Car 24208577 7YWB 3.8L L67 H Car

Part Numbers are accurate at the time of printing and are subject to change. Refer to the latest GMSPO Parts Catalog for part numbers of Goodwrench SRTA transaxles and service parts.

Parts are currently available from GMSPO.

General Service Guidelines and Unique Transaxle Features

Cooler Flushing

The transaxle oil cooler must be flushed whenever a transaxle is removed from the vehicle for service or if fluid contamination is suspected. Use Kent-Moore tool J 35944-A and solvent J 35944-20 to flush the cooler. Instructions for using the cooler flushing tool are published in the Transaxle On-Vehicle Service Section of each Service Manual.

External Appearance

The HYDRA-MATIC 4T65-E transaxle can be identified and differentiated from the 4T60-E by the following:

- No vacuum modulator

- The servo covers are flat

- The wiring harness connector is located on the top of the bell housing area in the twelve o'clock position and faces away from the engine mating surface.

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.