Drivetrain - Rear Axle Pinion Seal Leaking
Number: 92-246-4BSecton: 4B
Date: AUGUST 1992
Corporate Bulletin No.: 264203
ASE No.: A3
Subject:
REAR AXLE PINION SEAL LEAK
Model and Year:
1988-92 C/K, R/V AND G TRUCKS
Some owners of 1988-92 C/K, R/V, and G trucks equipped with 8-1/2 inch ring gear rear axles may comment that their vehicle experiences a leak at the rear axle pinion seal.
Leaks may be the result of dirt entering the seal causing increased wear of the sealing material.
This leak may be corrected by installing a new seal which features a double lip design. The previous pinion seal was a single lip design.
SERVICE PROCEDURE:
Refer to the appropriate service manual Section 4B REAR AXLE, "PINION FLANGE, DUST DEFLECTOR/OIL SEAL REPLACEMENT" for replacement procedure.
IMPORTANT:
Reassembly of the pinion flange in the same location is important to avoid vibration. Be certain to scribe a line on the pinion stem, pinion nut and pinion flange and record the number of exposed threads on the pinion stem as described in the service manual. This is especially important on 1992 C/K Utilities and Suburbans and G-Vans as these axles are system balanced as a unit with the pinion flange weighted as a harmonic member.
SERVICE PARTS INFORMATION
Part Number Description Qty/Veh
26033578 Seal, Differential 1
Pinion
Parts are currently available from GMSPO.
WARRANTY INFORMATION
For vehicles repaired under warranty use:
Labor Operation:
F2023
Labor Time:
Refer to appropriate Labor Time Guide for Labor Time