A/T - Unit Exchange Program
File In Section: 7 - TransmissionBulletin No.: 47-71-27A
Date: April, 1995
Subject:
Goodwrench Transmission Assembly Program Introduction (Previously SRTA Program)
Models:
1995 Oldsmobile Aurora with Hydra-Matic 4T80-E (RPO MH1)
This bulletin is being revised to add Figure 9, change parts information and to add a service manual update reference. Please discard Corporate Bulletin Number 477127 (Group Reference 7 - Transmission).
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. overnight 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
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 Nm (6-9 lb.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.
Service/Parts Information Figures
Core Return Procedure