C 20 3/4 Ton Pickup 2WD V8-379 6.2L DSL VIN J FI (1982)
Torque Converter: Customer Interest
A/T - Loss of Power In Drive and Reverse
Number:
84-93
Section:
7A (VIIc)
Date:
April, 1984
Subject:
LOSS OF POWER IN DRIVE AND REVERSE - THM TRANSMISSIONS
Model and Year:
1981-84 THM 125C, 200, 200-4R, 400, AND 700-R4 TRANSMISSIONS DIESEL ENGINES ONLY
TO:
ALL CHEVROLET DEALERS
This cancels and replaces Chevrolet Dealer Service Bulletin 84-93 dated March, 1984 which should be destroyed. This bulletin clarifies
engine/transmission combination and removes reference of 9Y6 with 700-R4 transmissions.
Some THM 125C, 200C, 200-4R, 400, and 700-R4 transmissions may experience a loss of power in drive and reverse ranges. If this condition is
experienced at approximately 30-35 mph, then it may be caused by a damaged torque converter assembly.
Beginning with 1984 production new torque converters went into production for diesel equipped vehicles. The new torque converters will have the
blades brazed into the pump shell. This process increases the ability of the pump blades to retain their position in the pump housing. The torque
converters will appear identical except for one (1) type used on the THM 400 transmission which will not have any exterior embossments welded.
When servicing any THM 125C, 200C, 200-4R, 400 or 700-R4 transmissions for a loss of power in drive and reverse, refer to the chart below for
replacement part numbers, identification, and model application.
THM Model
P/N
New Ident.
Application by Model
THM 125C
8653936
FH5
1982 Thru 1984 OP.
THM 200C
8638926
CE9D
1982 Thru 1984 OR.
8638927
CG9D
1981 AS, HT, OT.
1983 Thru 1984 OU.
THM 200-4R
8638926
CE9D
1984 OF.
8638927
CG9D
1982 Thru 1984 OM.
1984 OY.
THM Model
P/N
New Ident.
Application by Model
THM 400
8629917
4M
1982 FD, FF, FX, FY.
1983 FD, FF, FR, FS, FU, FX, FY.
1984 FD, FF, FR, FS, FU, FV, FX, MA.
THM 700-R4 8642992
CGAD
1982 9TN, 9TP, 9M6, 9MH.
1983 3MH, 3TL, 3TP, 3TS, 3TZ, 3T8, 3VJ.
1984 4MG, 4MH, 4TL, 4TM, 4TZ, 4T8, 4VE, 4VJ, 4VX.
