K 2500 Truck 4WD V8-454 7.4L (1990)
Extension Housing: All Technical Service Bulletins
Driveline - Clunk During Garage Shift, Acceleration
GMC NUMBER:
90-7A-19
GROUP:
7A - Automatic Transmission
DATE:
December, 1989
CORPORATE
NUMBER:
977150
SUBJECT:
DRIVELINE CLUNK DURING GARAGE SHIFT OR HARD ACCELERATION (INSTALL PLATE)
MODELS:
1990 C TRUCKS WITH 4L60, 3L80, 5LM60 OR HM-117
GMC TRUCK RECOMMENDS THAT A COPY OF THIS BULLETIN ALSO BE FILED UNDER SECTION 7B - MANUAL TRANSMISSION.
BULLETIN COVERS:
Service and parts information for vehicles which may exhibit a cliinking noise during a garage shift or a driveline clunk during hard acceleration.
Vehicles may be affected if they were built within the following VIN number range:
GMC
1GTDC14Z1LZ500000 -
1GTDC14EXLZ500368
Figure No. 1
SERVICE PROCEDURE:
(Figure 1)
This condition can be repaired by installing a reinforcement plate in the tailshaft crossover support. To install the reinforcement plate, remove the nut
and washer from the underside of the transmission crossmember. Install reinforcement plate onto the bolt that passes through crossmember and replace
the washer and nut. Torque the nut 54 N-m (40 lb.ft.).
