A/T Oil Pan - Leaks

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Bulletin No. T-90-16
File in Group 7
Number 211
Corp. Ref. No. 977117R
Date Nov. 1989

Figure 1 - Side Cover to Channel Plate Gasket:

Figure 2 - Bottom Pan Designs:

SUBJECT: NEW MATERIAL FOR SIDE COVER TO CHANNEL PLATE GASKET (THM 440-T4/4T60 AND THM F-7 TRANSAXLES) AND NEW BOTTOM PAN AND GASKET (THM F-7 TRANSAXLE)

MODELS AFFECTED: 1985-1989 DE VILLES AND FLEETWOODS 1986-1989 ELDORADOS AND SEVILLES 1987-1989 ALLANTES


Some 1985-1989 DeVilles and Fleetwoods, 1986-1989 Eldorados and Sevilles, or 1987-1989 Allantes may experience transmission fluid leaks at the side cover due to crushing or splitting of the gasket when the cover nuts are torqued during assembly. The new side cover to channel plate gasket uses a latex coated cellulose which resists crushing and splitting. As of November 1, 1988 (Julian Date 306), all THM 440-T4/HYDRA-MATIC 4T60 and THM F-7 models have been built with the new gasket.

In addition, changes to the THM F-7 transaxle bottom pan include a revised design which uses a continuous raised rib on the pan rail in combination with the latex coated cellulose gasket. These changes were made in production on January 30, 1989 (Julian Date 030) and were made previously on the THM 440-T4/HYDRA-MATIC 4T60.

IMPORTANT: The new bottom pan must be used with the new gasket. If the previous design pan is used with the new gasket or the new design pan is used with a cork gasket, fluid leaks may develop.

Service Parts Information:

Description P/N Usage

Package Side Cover Gaskets Kit - THM 440/4T60 & THM F-7 8644902 1985-1989
^ Gasket, Side Cover to Case
^ Gasket, Side Cover to Channel Plate

The new latex coated cellulose side cover gasket will be available for service once the previous gasket stock has been used up. The gasket will not be available separately but can be obtained by ordering the Side Cover Gasket Kit Package or the Complete Overhaul Repair Package.

Bottom Pan Package - THM F-7 8661917 1987-1989
^ Gasket, Bottom Pan (Latex Coated Cellulose)
^ Bottom Pan
^ Chip Collector Magnet

Gasket, Bottom Pan - THM F-7 8668028 1987-1989
(Latex Coated Cellulose)