Drivetrain - Front Axle Seals Leak

Group Ref.: Drive Axle
Bulletin No.: 364302
Date: February, 1994

SUBJECT:
FRONT AXLE SEALS LEAK (REPLACE SEALS AND AXLE SHAFTS)

MODELS:
1991-93 CHEVROLET AND GMC K1, 2, 3 TRUCKS

CONDITION:





Some owners may comment that one or both front differential output shaft seals leak (Figure 1, Item 3).

CAUSE:

Differential output shaft (Figure 1. Item 1) surface finish may not be correct. This may cause premature seal wear and leaks.

CORRECTION:

When replacing a leaking output shaft seal (Figure 1, Item 3), the output shaft (Figure 1. Item 1) should be inspected. If the shaft is rough or the prior seal lasted less than 20,000 miles, the shaft should also be replaced.

SERVICE PROCEDURE

Inspect the shaft surface finish where the seal contacts the shaft. This area should be smooth with no roughness. If the shaft feels rough when dragging a finger nail over the area, it should be replaced. The shaft should also be replaced if the prior seal started leaking within 20,000 miles.

For right shaft and seal replace, refer to the appropriate year C/K Truck Service Manual, Section 4C - Front Axle, Shaft and Axle Tube Assembly Replacement.

For left shaft and seal replace, refer to the appropriate year C/K Truck Service Manual, Section 4C - Front Axle, Output Shaft Replacement.

SERVICE PARTS INFORMATION

P/N Description

26006822 Shaft, Diff Output RH, K1, K2/C5Z
26006824 Shaft, Diff Output LH, K1, K2/C5Z
26031836 Shaft Kit, Diff Output RH, K2/C6P, K3
26009627 Shaft, Diff Output LH, K2/C6P, K3
26031569 Seal, Front Drive Axle, K1, K2/C5Z
15521874 Seal, Front Drive Axle, K2/C6P, K3
15588363 Deflector, K1, K2, K3

RPO Definitions

C5Z - 7,200 lbs. GVWR
C6P - 8,600 lbs. GVWR

Parts are expected to be available from GMSP0 on 2/7/94.

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

Labor Op Description Labor Time

F1440 Right Seal, Output Use Published Labor
Shaft Replace Operation Time

F1441 Left Seal, Output Use Published Labor
Shaft Replace Operation Time

F1447 Both Seals, Output Use Published Labor
Shaft Replace Operation Time

GMC Truck Dealers

If an axle shaft(s) is replaced along with the seal, it is not necessary to use axle shaft replace labor operations F1420, F1421 or F1427. The seal replace labor ops listed above include time to R and R the shaft.

Chevrolet Dealers

If axle shaft replacement is necessary, use axle shaft replace labor operations F1420, F1421 or F1427 as applicable along with all parts required.