Bravada V6-262 4.3L VIN Z (1991)
Output Shaft: All Technical Service Bulletins
Output Shafts/Input Housing to Output Shaft Seal - New
NUMBER:
91-T-187
CORP.REF.NO.: 177118
DATE:
August 1991
SECTION:
7
SUBJECT
NEW OUTPUT SHAFTS AND INPUT HOUSING TO
OUTPUT SHAFT SEAL
MODELS/YEARS
1991 CUSTOM CRUISER AND BRAVADA EQUIPPED
WITH HYDRA-MATIC 4L60 TRANSMISSION (RPO MD8)
This bulletin covers HYDRA-MATIC 4L60 output shafts and input housing to output shaft seals that have been revised to provide increased lube flow.
Since lube hole locations have changed, the input housing to output shaft seal has been revised to accommodate them. Beginning January 28, 1991
(Julian Date 028), all HYDRA-MATIC 4L60 transmissions were built using the new output shafts and seals.
SERVICE INFORMATION: The NEW SEAL can only be used on the NEW OUTPUT SHAFTS. If the new seal is used on a previous model output
shaft, the seal will block one of the lube passages.
Figure 1
The previous seal can be used on both the new and previous output shafts.
The new output shafts and seal, if used together, will service any HYDRA-MATIC 4L60/THM 700-R4 transmission ever built.
The new output shafts can be identified by lube hole location. They have a lube hole on the chamfer at the front of the output shaft. The lube hole was
previously located on the shank of the output shaft.
