TRAN OIL LEAK FINAL DRIVE AREA GOVERNOR CUP PLUG

TRANSMISSION OIL LEAK IN FINAL DRIVE AREA - THM 325-4L

1982 Eldorados and Sevilles equipped with THM 325-4L transmissions may experience a transmission oil leak in the final drive to transmission case mating area and/or an erratic upshift caused by a loose or missing governor cup plug in the transmission case passage (refer to Figure 1).

The cup plug was secured in production with Loctite effective with the listed transmission serial numbers. On the THM 325-4L, the serial number is located on the driver side of the bell housing and uses the following format:

Model Year Model Serial Number (Engine Application) ---------- ----- ------------- -------------------- 82 AJ 58856 (HT4100 engine) 82 AL 8327 (Diesel engine) 82 AM 5587 (V-6 engine)

To correct transmissions with this condition, proceed as follows:

1. Remove final drive (refer to 1982 Cadillac Service Information Manual, page 4C-3).

2. Remove original governor cup plug.

3. Install a new governor cup plug (P/N 8620318) using Loctite 240 or equivalent to seal the cup plug to the transmission case. Staking the cup plug into the transmission case will not assure an adequate seal.

4. Install final drive assembly with new gasket (P/N 1620403) (refer to 1982 Cadillac Service Information Manual, page 4C-3).

For warranty purposes, use Operation T6063 at 1.7 hours (V-8) or 2.1 hours (V-6).

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.