Transfer Case - Oil Leak at Rear
90chevy28Number: 90-286-7D
Section: 7D
Date: July 1990
Corp. Bulletin No.: 067404R
Subject: OIL LEAK FROM REAR OF TRANSFER CASE
Model and Year: 1990 L VANS
Figure No. 1:
TO: ALL CHEVROLET DEALERS
Some 1990 L vans may exhibit a small oil leak from the rear of the transfer case when parked on an inclined surface with the front of the vehicle higher than the rear.
To correct, it is necessary to clean the hole at the rear of the yoke and the area around the hole using a rag and solvent suitable for oil residue removal. Using a thin flat applicator, such as a tongue depressor or similar object, pack enough silicone sealer into the hole at the rear of the yoke to seal the hole. GM Part Number 1052917 or equivalent silicone sealer may be used. REMOVAL OF THE DRIVE SHAFT SHOULD NOT BE NECESSARY.
Vehicles built after the following VIN breakpoint have a redesigned yoke that eliminates the hole:
1GNDM157XLB166478
WARRANTY INFORMATION
For vehicles repaired under warranty use:
Labor Operation Number: T7006
Labor Time: .2 hr.
NOTE: Labor Operation is coded to base vehicle coverage in the warranty system.