FRONT AXLE SEALS LEAK (REPLACE SEALS AND AXLE SHAFTS). GMC Truck GMC Suburban

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 GMSPO ON 2/7/94.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME F1440 RIGHT SEAL, OUTPUT SHAFT REPLACE

F1441 LEFT SEAL, OUTPUT USE PUBLISHED SHAFT REPLACE LABOR OPERATION TIME F1447 BOTH SEALS, OUTPUT SHAFT REPLACE

**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.

FIGURES: 1

CAPTIONS: FIGURE 1 - FRONT AXLE ASSEMBLY

Object Number: 83040 Size: FS

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.