EXCHANGE PROGRAM - INFO. ON GOODWRENCH TRANS. ASSY. PROG.

REVISION: 08/16/94

THIS BULLETIN IS BEING REVISED TO CORRECT THE N.M READING UNDER SERVICE INFORMATION SECTION/BOTTOM PAN BOLT TORQUE PROCEDURE. ********************************************************************** REVISION: 03/21/95

THIS BULLETIN IS BEING REVISED TO ADD FIGURE 9, CHANGE PARTS INFORMATION AND TO ADD A SERVICE MANUAL UPDATE REFERENCE. PLEASE DISCARD BULLETIN 477127 (GROUP REFERENCE 7 - TRANSMISSION). **********************************************************************

SUBJECT: EXCHANGE PROGRAM -- INFORMATION ON GOODWRENCH TRANSMISSION ASSEMBLY PROGRAM INTRODUCTION (PREVIOUSLY SRTA PROGRAM)

MODELS: 1995 OLDSMOBILE AURORA WITH HYDRA-MATIC 4T80-E (RPO MH1)

THE HYDRA-MATIC 4T80-E GOODWRENCH TRANSMISSION ASSEMBLY PROGRAM (PREVIOUSLY SRTA PROGRAM) AND LIMITED ON-VEHICLE REPAIR IS BEING INTRODUCED BEGINNING MAY 1, 1994. THIS GOODWRENCH TRANSMISSION MODEL CAN ONLY BE ORDERED AS A V.I.P. UNIT THROUGH YOUR LOCAL GENERAL MOTORS SERVICE PARTS OPERATION (GMSPO), PARTS DISTRIBUTION CENTER.

THE HYDRA-MATIC 4T80-E IS A NEW FRONT-WHEEL DRIVE ELECTRONICALLY CONTROLLED TRANSAXLE USED IN THE OLDSMOBILE AURORA WITH THE PREMIUM V8 DOHC ENGINE.

BEFORE REMOVING AN EXISTING HYDRA-MATIC 4T80-E, PCM ADAPTIVE CONTROL INFORMATION CONCERNING THAT UNIT "MUST" BE RECORDED ON THE PRODUCT FEEDBACK FORM PROVIDED AND RETURNED WITH THAT CORE.

WHENEVER A HYDRA-MATIC 4T80-E REPLACEMENT IS NECESSARY, THERE ARE TWO PCM OUTPUT OVERRIDES WHICH MUST BE CLEARED. THIS INFORMATION IS GIVEN IN THE SERVICE INFORMATION SECTION OF THIS BULLETIN.

GOODWRENCH TRANSMISSION ADVANTAGES:

- GOODWRENCH TRANSMISSIONS ARE THE PRODUCT OF A HIGHLY SUCCESSFUL, CUSTOMER SATISFACTION DRIVEN PROGRAM WHICH PARALLELS EXISTING HYDRA- MATIC PROGRAMS.

- ALL GOODWRENCH TRANSMISSION UNITS ARE DESIGNED AND REMANUFACTURED TO CURRENT ENGINEERING SPECIFICATIONS AND ARE OFTEN LESS COSTLY THAN A MAJOR OVERHAUL.

- GMSPO PARTS DISTRIBUTION CENTERS ARE COMMITTED TO 48-HOUR MAXIMUM DELIVERY TIME FOR ALL GOODWRENCH TRANSMISSION MODELS, WITH NO VIP CHARGES.

- IN ORDER TO PROPERLY ANALYZE 1995 TRANSMISSION CONCERNS, PLEASE RETURN ORIGINAL UNIT TO YOUR LOCAL PDC "AS SOON AS POSSIBLE".

GENERAL GUIDELINES:

GOODWRENCH TRANSMISSION OR ON-VEHICLE SERVICE

- TO PROPERLY DIAGNOSE THE HYDRA-MATIC 4T80-E TRANSAXLE, AND DETERMINE WHEN A HYDRA-MATIC 4T80-E GOODWRENCH TRANSMISSION IS NEEDED, IT IS RECOMMENDED THAT DRIVEABILITY AND TRANSMISSION TECHNICIANS TAKE THE PREMIUM V8 POWERTRAIN CONTROLS COURSE 16022.01 (IN CANADA 16013.16) AND THOROUGHLY UNDERSTAND TRANSAXLE INFORMATION CONTAINED IN SECTIONS 6E AND 7A OF THE AURORA SERVICE MANUAL.

- TRANSAXLE CONDITIONS CONSIDERED FOR GOODWRENCH TRANSMISSION USAGE:

- ALL REPAIRS WHICH CANNOT BE CORRECTED BY REPLACEMENT OF THE PARTS SHOWN IN FIGURE 2.

- IT HAS BEEN DETERMINED BY COMPLETE DIAGNOSIS AND TROUBLESHOOTING, USING THE PROCEDURE OUTLINED IN SECTIONS 6E AND 7A OF THE AURORA SERVICE MANUAL AND ON-VEHICLE DIAGNOSTIC INFORMATION AND OVERRIDES, THAT THE UNIT NEEDS TO BE REPLACED.

- DEALERSHIP OVERHAULS FOR THE ENTIRE TRANSAXLE WILL NOT BE ALLOWED.

- DEALER HYDRA-MATIC 4T80-E TRANSAXLE REPAIRS INCLUDE: - LIMITED ON-VEHICLE SERVICEABLE ITEMS. (REFER TO FIGURE 2)

PARTS INFORMATION:

HYDRA-MATIC 4T80-E GOODWRENCH TRANSMISSION MODEL REPLACEMENT INFORMATION:

PART FOR NUMBER SERVICE MODEL QUANTITIES/DESCRIPTION USE

24203877 5MPN (1) AURORA 3.48 FINAL DRIVE/4PLATE 2ND CI-VCC 24203878 5MSN (1) AURORA 3.71 FINAL DRIVE/4PLATE 2ND CI-VCC 24202540 5BMN (1) AURORA 3.48 FINAL DRIVE/4PLATE 2ND CI-TCC 24202541 5BBN (1) AURORA 3.71 FINAL DRIVE/4PLATE 2ND CI-TCC 8684953 ALL (1) BOTTOM PAN GASKET (61),LEFT(51),RIGHT(52) SCAVENGER SCREENS AND SEALS(53) 8677554 ALL (1) CASE EXTENSION AXLE SEAL (125) RIGHT 8679679 ALL (1) CASE COVER AXLE SEAL (37) LEFT 8684086 ALL (1) COOLER FITTING (38) TO COOLER 8685767 ALL (1) COOLER FITTING (3) RETURN 00444613 ALL (1) LINE PRESSURE PLUG (40) HEX HEAD 8682118 ALL (1) LINE PRESSURE PLUG (40) ALLEN HEAD 8682117 ALL (1) DRAIN PLUG (8) 8685612 ALL (1) FLUID LEVEL INDICATOR (31) 8685051 ALL (1) OUTPUT SPEED SENSOR (130) AND SEAL 24201070 ALL (1) LOWER VALVE BODY ASSEMBLY (903) 03530297 ALL (2) NUT, CHANNEL PLATE TO CASE (955) 8679437 ALL (1) PLATE, OIL TRANSFER (956) 11507087 ALL (2) BOLT, CHANNEL PLATE TO CASE (958) (USE 11507087 TOGETHER WITH 11500365 WASHER AND 12345493 SEALING ADHESIVE) 11503782 ALL (17) BOLT, CHANNEL PLATE CONTROL VALVE BODY ASM./CASE (534)

PARTS ARE CURRENTLY AVAILABLE AT GMSPO.

FOLLOW SERVICE PROCEDURES OUTLINED WITH THE COMPONENTS WHENEVER REPLACEMENT IS NECESSARY.

SERVICE INFORMATION:

THE FOLLOWING MUST BE PERFORMED WHENEVER A HYDRA-MATIC 4T80-E REPLACEMENT IS NECESSARY. RECORD ALL ADAPTIVE PARAMETER INFORMATION "BEFORE" REMOVING THE EXISTING TRANSAXLE. THIS INFORMATION SHEET "MUST" BE RETURNED WITH THE CORE UNIT. PHOTOCOPY FIGURE 6 FOR ADDITIONAL COPIES OF ADAPTIVE CONTROL FORMS.

- COOLER FLUSHING COOLER FLUSHING MUST BE PERFORMED WHENEVER A TRANSMISSION/ TRANSAXLE IS REMOVED FOR SERVICE. IT IS ESSENTIAL TO FLUSH THE COOLER FOR GOODWRENCH TRANSMISSION INSTALLATION, MAJOR OVERHAUL, IN CASE OF PUMP OR TORQUE CONVERTER REPLACEMENT, OR WHEN FLUID CONTAMINATION IS SUSPECTED. USE KENT-MOORE TOOL J 35944 TO FLUSH THE COOLER. * COOLER FLOW RATES: 1500 + RPM = 7-9 LITERS AT MIN. LINE, 12-14 MAX. LINE.

- FLUID CHECKING PROCEDURE FOLLOW THE FLUID CHECKING PROCEDURE OUTLINED IN FIGURE 3 WHENEVER CHECKING OR ADDING FLUID TO THE HYDRA-MATIC 4T80-E TRANSAXLE.

THIS FLUID CHECKING PROCEDURE REPLACES THE PROCEDURE IN THE SERVICE MANUAL. PLEASE UPDATE YOUR SERVICE MANUAL ACCORDINGLY.

- BOTTOM PAN BOLT TORQUE PROCEDURE WHENEVER REPLACEMENT OF THE BOTTOM PAN GASKET IS NECESSARY, REFER TO FIGURE 4. THIS INFORMATION IS ALSO CONTAINED IN ALL BOTTOM PAN GASKET SERVICE PACKAGES. THE FINAL TORQUE SPECIFICATION OF 10-12 N.M (8-9 LBS FT) MUST NOT BE EXCEEDED. IF THIS SPECIFICATION IS EXCEEDED, THE BOTTOM PAN GASKET COULD BE DAMAGED AND A TRANSAXLE FLUID LEAK MAY RESULT.

- HYDRA-MATIC 4T80-E TRANSAXLE REMOVAL AND REPLACEMENT PROCEDURE REFER TO THE ON-VEHICLE REPAIR SECTION IN THE OLDSMOBILE AURORA SERVICE MANUAL WHENEVER THE REMOVAL AND INSTALLATION OF A HYDRA-MATIC 4T80-E TRANSAXLE IS NECESSARY.

FIGURES: 9 ATTACHMENTS: 0

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER." THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS OCCURRING 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 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.

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