K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Seals and Gaskets: By Symptom
Technical Service Bulletin # 924B110
Date: 920701
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
Technical Service Bulletin # 924B110
Date: 920701
Drivetrain - Rear Axle Pinion Seal Leak
GMC NUMBER:
92-4B-110
