G 20 Van V6-262 4.3L VIN Z (1993)
Extension Housing: All Technical Service Bulletins
A/T - Wrong Case Extension, ATF Leak/Vibration
Group Ref.: Transmission
Bulletin No.: 377122
Date: January, 1994
SUBJECT:
VIBRATION/FLUID LEAK OUT OF CASE EXTENSION (REPLACE CASE EXTENSION ASSEMBLY)
MODELS:
1993 CHEVROLET AND GMC C AND P TRUCKS AND G-VAN
TRANSMISSION MODELS:
ABP, ADP, AFP, DCP, DSP, TXP, TWP, LAP, MHP, JDP, BAP, BSP, MAP, MBP, MCP, MJP, MLP
TRANSMISSION APPLICATIONS:
1993 HYDRA-MATIC 4L80-E/4L80-EHD (MT1)
THIS BULLETIN HAS BEEN REVISED TO CORRECT THE PARTS INFORMATION. PREVIOUS DIVISIONAL PUBLICATION NUMBERS
WERE:
DIVISION
BULLETIN #
CHEVROLET
93-185-7A
GMC TRUCK
93-7A-75
GM CANADA
93-7A-140
HYDRA-MATIC
9374L80E09
CONDITION:
Some HYDRA-MATIC 4L80-E/4L80-EHD transmissions may leak fluid at the back of the case extension assembly (19) or a vibration may be noticed
in all ranges at all speeds.
CAUSE:
This is caused by the extension bushing (77) not seated properly due to an oversized bore, possibly interfering with the case extension helix-seal
assembly (20).