K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Differential Case: All Technical Service Bulletins
Driving Axle (Front) - Fluid Leak From Vent
GMC NUMBER:
91-4C-163
GROUP:
4C Front Axle
DATE:
November, 1991
CORPORATE NUMBER: 164305
SUBJECT:
FRONT AXLE VENT HOSE CONNECTOR LEAK (REPLACE VENT HOSE CONNECTOR)
MODELS:
1988 - 1991 K-TRUCKS
Some 1988-91 K-trucks may experience a leak at the front axle vent hose connector. This leak usually occurs at the threads of the front axle vent hose
connector.
This leak may be caused by inadequate sealer applied to the vent connector threads and relaxation or shrinkage of the vent connector material.
This leak may be corrected by replacing the vent hose connector with a revised connector featuring an O-ring seal.
Figure 1
SERVICE PROCEDURE:
Remove (Figure 1)
1. Front axle skid plate (if equipped).
2. Clamp (52).
3. Hose (53) from the vent connector.
4. Vent hose connector (54).
