4T60-E SERVICE REPLACEMENT TRANS. ASSY. (SRTA INTRO)

SUBJECT: SERVICE REPLACEMENT TRANSMISSION ASSEMBLY (SRTA) PROGRAM INTRODUCTION AND ON-CAR REPAIR GUIDELINES - 4T60-E - ON 1991 DE VILLES, FLEETWOODS, ELDORADOS, AND SEVILLES

Beginning with 1991 all front wheel drive Cadillacs, except Allante, are produced using the Hydra-Matic 4T60-E transaxle. This new transaxle uses electronic controls to command all shifts.

A Service Replacement Transmission Assembly (SRTA) program has been developed for the 4T60-E. This program parallels those existing for the Hydra-Matic 3T40, Hydra-Matic 4T60, and Hydra-Matic 41-60.

SRTA Advantages:

o All SRTA units are designed and remanufactured to current engineering specifications and are often less costly than major overhaul.

o GMSPO Parts Distribution Centers are committed to 48-hour maximum delivery time for all SRTA models with no VIP charges.

Refer to the following sections of this bulletin when servicing the 4T60-E transaxle:

Section Page

Service Guidelines ......................................1 SRTA Processing Procedures ..............................2 Information Packet...................................2 Core Exchange Return ...............................2 Failure Analysis Information.........................2 Hydra-Matic 4T60-E Transmission Identification ..........2 SRTA Model Replacement Chart ............................3

Service Guidelines:

o On-Car and Overhaul Service or SRTA

- Dealership overhauls for the 4T60-E are allowed. Refer to Figure 1 for serviceable components.

Generally, use of the SRTA transaxle should be considered when the cost of repair can reasonably be expected to exceed the cost of SRTA replacement.

Parts are currently available from GMSPO.

Cooler Flushing:

NOTICE: Cooler flushing MUST be performed whenever a transaxle is removed for service including, but not limited to, SRTA installation, major overhaul, pump or torque converter replacement, or when fluid contamination is suspected. Use Kent-Moore tool J-35944 to flush the cooler following procedures listed in Section 7Al of the Service Information Manual*.

Cooler flush procedures are carry over from past model years and as such are not printed in the New Product Information Manual. The final edition Service Information Manual will include flush procedures.

SRTA Processing Procedure:

Each SRTA unit will be shipped in a container which must be used for core return of the original Hydra-Matic 4T60-E assembly. A SRTA information packet is included with each SRTA unit. The contents of this envelope are to be removed and used as described.

SRTA Processing Procedures - Information Packet:

The contents of this envelope include limited warranty information, dealer product feedback form, core exchange return procedure, and a pre-addressed return mailing envelope. A dealer representative will explain to the customer all warranty information contained in this envelope.

SRTA Processing Procedure - Core Exchange Return:

The core return procedure provides detailed instructions for the GM dealer on handling the SRTA and original Hydra-Matic 4T60-E units. The shipping labels are included in the package of information that is included with every Hydra-Matic 4T60-E SRTA unit.

SRTA Processing Procedure - Failure Analysis Information:

This product feedback form is to be completed by the service manager and/or technician. Fill out this form as completely as possible to provide information which can be used for analysis. This valuable input can result in future product refinement through corrective action. Insert the white copy of the completed form and a copy of the repair order into the SRTA information packet envelope, re-seal the envelope, and wire tag it to the bell housing of the unit being returned for core exchange. Retum the yellow copy of the completed product feedback form, using the postage paid envelope, to Hydra-Matic Division.

Hydra-Matic 4T60-E Transaxle Identification Information:

Transaxle identification information and the SRTA model replacement chart will assist in selecting the correct SRTA unit to order from your local Parts Distribution Center. Refer to Figure 6 for transaxle tag and SRTA tag information.

Hydra-Matic 4T60-E SRTA Model Replacement Chart:

SRTA SRTA Model P/N Description ----- ------- ------------------ 1AHW 8651957 Cadillac C-Car Export 1AYW 8651960 Cadillac E/K-Car (Touring) 1AMW 8651952 Cadillac E/K-Car 1APW 8651958 Cadillac E/K-Car Export 1AVW 8651959 Cadillac C-Car 1AZW 8651953 Cadillac C-Car Limo

Parts Information:

o Part numbers are accurate at the time of printing and subject to change. Refer to the latest GMSPO Parts Catalog for part numbers of SRTA models fisted.

o 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.