4T60-E SERVICE REPLACEMENT TRANS. ASSY. (SRTA INTRO). Buick Reatta 1991

For 1990-2009 cars

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

#### SUBJECT: SERVICE REPLACEMENT TRANSMISSION ASSEMBLY (SRTA) PROGRAM INTRODUCTION AND ON-CAR REPAIR GUIDELINES

#### MODELS AFFECTED: 1991 PARK AVENUE, RIVIERA AND REATTA

THIS BULLETIN IS BEING ISSUED TO INCLUDE 1991 RIVIERA AND REATTA MODELS AND TO UPDATE SRTA PART NUMBERS.

#### BULLETIN COVERS:

The Hydra-Matic 4T60-E Service Replacement Transmission Assembly (SRTA) Program beginning with the 1991 model year and limited on-car repair guidelines. SRTA models and on-car service parts can be ordered for all Hydra-Matic 4T60-E models from your local General Motors Service Parts Operation (GMSPO) Parts Distribution Center.

The Hydra-Matic 4T60-E is a new transaxle model with electronic shift controls to control shift points.

#### SRTA ADVANTAGES:

- A SRTA is the product of a highly successful, customer satisfaction driven program that parallels the existing Hydra-Matic 3T40, Hydra-Matic 4T60 and Hydra-Matic 4L60 programs.

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

In the interest of customer satisfaction, SRTA models should only be considered when the projected cost of repair exceeds the cost of a SRTA replacement.

Return all transmission/transaxle SRTA cores for all programs in a timely manner to the local GMSPO Part Distribution Center (PDC). This will help ensure that the SRTA program remains a highly successful, customer satisfaction driven program.

(Figure 1)

#### GENERAL GUIDELINES:

o On-Car Service or SRTA:

- Dealership overhauls for the entire transaxle will be allowed after September 01, 1990 (providing the technician has taken the Hydra-Matic 4T60-E two-day training class number 17002.03). Until then, limited on-car repairs and SRTA will be the only service options.

- Transaxle conditions considered for SRTA usage:

All repairs that cannot be corrected by replacement of the parts shown in Figure 1.

- Dealer Hydra-Matic 4T60-E transaxle repairs include:

Limited on-vehicle serviceable items. Reference Figure 1.

Parts needed to perform limited on-vehicle service on a Hydra-Matic 4T60-E transaxle are available through your local Parts Distribution Center (PDC).

#### COOLER FLUSHING:

#### NOTICE: Cooler flushing MUST be performed whenever a transmission/ transaxle is removed for service. It is essential to flush the cooler for SRTA installation, major overhaul, in any case of pump or torque converter replacement, or when fluid contamination is suspected. Use Kent-Moore Tool J-35944 to flush the cooler.

1991 HYDRA-MATIC 4T60-E SERVICEABLE COMPONENTS:

ILLUSTRATION PART NUMBER NUMBER DESCRIPTION ----------- ------------ ------------------------ 8666007 4 SEAL, ASSEMBLY - AXLE OIL *11509041 9 BOLT (SPEED SENSOR) *10456034 10 SPEED SENSOR ASSEMBLY *11508600 12 BOLT (FORWARD SERVO COVER) *8651916 13 FORWARD SERVO COVER *8651567 14 SEAL O'RING (FORWARD SERVO COVER) *12337905 23 BOLT (BOTTOM PAN) *8651914 24 TRANSAXLE OIL PAN *8676250 25 TRANSAXLE OIL PAN GASKET (GASKET IS REUSABLE UNLESS DAMAGED) 8676164 28 BALL CHECK ASSEMBLY 8651654 29 COOLER PIPE FITTING *11509511 30 BOLT (MODULATOR TO CASE) 8627650 31 RETAINER MODULATOR 8662967 32 MODULATOR 10054241 33 MODULATOR O'RING 8658375 34 MODULATOR VALVE *8651620 35 ELECTRICAL CONNECTOR *8651621 36 ELECTRICAL CONNECTOR O'RING 8656536 39 RETAINING RING *8651915 40 REVERSE SERVO COVER 8658111 41 SEAL O'RING (REVERSE SERVO) 8656394 50 NUT FLANGED 8656395 51 CONICAL WASHER 8656392 52 SCREW & CONICAL WASHER 8651472 53 SIDE COVER 8644902 54 and 55 SIDE COVER GASKET KIT *8651909 100 FILTER ASSEMBLY 8656613 101 SEAL ASSEMBLY FILTER 8644637 409 SEAL ASSEMBLY (LEFT SIDE AXLE) 8664812 525 SEAL ASSEMBLY (CONVERTER)

#### IMPORTANT: Components noted with asterisk "*" are unique to the Hydra-Matic 4T60-E. Remaining components are common with the Hydra-Matic 4T60.

Parts are currently available from GMSPO for the part numbers: 8666007, 11509041, 11508600, 8651916, 8651567, 12337905, 8651914, 8676250, 8676164, 8651654, 11509511, 8627650, 8662967, 10054241, 8658375, 8651620, 8651621, 8656536, 8651915, 8658111, 8656394, 8656395, 8656392, 8651472, 8644902, 8651909, 8656613, 8644637 and 8664812.

Part number 10456034 is expected to be available on 10-30-90. Until then normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be canceled as incorrectly ordered while the 400 control is in place.

(Figure 2)

#### 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 with each illustration on the following pages.

(Figure 3)

#### 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 is to explain to the customer all warranty information contained in this envelope.

(Figure 4)

#### SRTA PROCESSING PROCEDURES - 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.

(Figure 5)

#### SRTA PROCESSING PROCEDURES - 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, reseal the envelope and wire tag it to the bell housing of the unit being returned for core exchange. Return the yellow copy of the completed Product Feedback form, using the postage paid envelope, to Hydra-Matic Division.

(Figure 6)

#### 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.

#### HYDRA-MATIC 4T60-E SRTA MODEL REPLACEMENT CHART:

SRTA SRTA Model Part ------ ------- 1YMW 8651950 1YMW 8651955 1YMW 8651951

#### PARTS INFORMATION:

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 listed.

Parts are currently available from GMSPO for part numbers 8651950 and 8651951.

Part number 8651955 is expected to be available on 10-30-90. Until then normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be canceled as incorrectly ordered while the 400 control is in place.

4 SEAL ASM., AXLE OIL 5 BOLT, HEX FLANGE (CASE EXTENSION) 36 N m (27 Lb. ft.) 9 BOLT, SPEED SENSOR 10 SPEED SENSOR ASM., COMPLETE 1 1SEAL, SPEED SENSOR O-RING 12 BOLT, FORWARD SERVO COVER 10 N m (89 Lb. In.) 13 COVER, FORWARD SERVO 14 SEAL, FORWARD SERVO COVER O-RING 23 BOLT, BOTTOM PAN 17 N m (151 Lb. In.) 24 PAN, BOTTOM TRANS. OIL 25 GASKET, BOTTOM OIL PAN 26 MAGNET, CHIP COLLECTOR 28 BALL CHECK ASM., COOLER LINE 52 N m (39 Lb. ft.) 29 FITTING, COOLER PIPE 44 N m (33 Lb. ft.) 30 BOLT, HEX FLANGE HEAD MOD. TO CASE 24 N m (18 Lb. ft.) 31 RETAINER, MODULATOR 32 MODULATOR ASM., TRANS. 33 SEAL, O-RING 34 VALVE, MODULATOR 35 CONNECTOR, ELECTRICAL 7-WAY 36 SEAL, O-RING 37 VENT ASM. TRANSMISSION 38 PLUG, PRESSURE TAP 39 RING, INTERNAL RETAINING 40 COVER, REVERSE SERVO 41 SEAL, O-RING 50 NUT, FLANGED HEX 8 N m (71 Lb. In.) 51 WASHER, CONICAL 52 SCREW, SIDE COVER CONICAL WASHER ASM. 11 N m (98 Lb. In.) 53 PAN, CASE SIDE COVER 54 GASKET, CASE SIDE COVER 55 GASKET, INNER CASE SIDE COVER 100 FILTER, TRANSMISSION OIL 101 SEAL ASM., FILTER NECK TO CASE 409 SEAL ASM., AXLE OIL (LEFT SIDE) 525 HELIX SEAL ASM., CONVERTER

Figure 1 - Allowable On-Vehicle Repair Parts

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.