Drivetrain - Rear Axle Pinion Seal Leak

GMC NUMBER:
92-4B-110

GROUP:
4B Rear Axle

DATE:
July 1992

CORPORATE NUMBER:
264203



SUBJECT:
REAR AXLE PINION SEAL LEAK (INSTALL NEW SEAL)

MODELS:
1988-92 C/K, R/V TRUCKS AND G VANS



Some owners of 1988-92 C/K, R/V trucks and G vans 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 Pinion 1

Parts are available. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency orders will be accepted. GMSPO will make every effort to obtain parts. However, the part will be shipped premium transportation at the dealer's expense and all other order types will be placed on backorder until the 400 control is removed.

WARRANTY INFORMATION
For vehicles repaired under warranty use:
Labor Operation:
F2023

Labor Time:
Refer to appropriate Labor Time Guide for Labor Time