Impala V8-305 5.0L VIN H 4-bbl (1982)
Seals and Gaskets: By Symptom
Technical Service Bulletin # 84104
Date: 840401
A/T - THM 200-R4 Fluid leaks
Number:
84-104
Section:
7A (VIIc)
Oate:
April, 1984
Subject:
TRANSMISSION OIL PAN, GASKET, AND BOLTS
Model and Year: ALL 200-4R
TO:
ALL CHEVROLET DEALERS
FIGURE 1 - TRANSMISSION OIL PAN
FIGURE 2 - HEX HEAD SCREW AND CONICAL WASHER ASSEMBLY
Beginning January 3, 1984, all THM 200-4R transmissions are being produced using a new transmission oil pan (Figure 1) , cork
gasket, and special hex head bolts with conical washers (Figure 2). The new transmission oil pan has a continuous ribbed flange (Figure
1) to reduce transmission oil leaks..
When servicing any THM 200-4R transmission for transmission oil pan leaks, refer to the following procedure:
SERVICE PROCEDURE
1.
Diagnose source of leak to be certain leak is from the transmission oil pan.
2.
If a leak is determined to be from the transmission oil pan area:
A.
Remove the oil pan.
B.
Clean the case oil pan face (with solvent) and visually inspect the case oil pan surface for damage and/or presence of RTV
sealant (room temperature vulcanizing sealant).
C.
Make sure all RTV sealant is removed from the case oil pan face.
3.
Replace the past transmission oil pan, with service package number 8639907 which contains the following:
P/N
Quantity
Description
8639556
1
Transmission Oil Pan
8634198
1
Gasket Transmission Oil Pan
8643693
16
Bolt Asm., With Conical Washer