LOW TRANS. FLUID LEVEL, TRANSFER CASE FLUID OVERFILLED. GMC Truck Yukon

SUBJECT: LOW TRANSMISSION FLUID LEVEL, TRANSFER CASE FLUID OVERFILLED (REPLACE TRANSFER CASE INPUT SHAFT SEAL)

MODELS: 1996-98 CHEVROLET AND GMC K1-2, T1 MODELS WITH NP231, NP233, NP241, NP243 TRANSFER CASE (RPOS NP1, NP2)

1997-98 ISUZU HOMBRE - WITH FOUR WHEEL DRIVE AND 4.3L ENGINE

CONDITION:

SOME OWNERS MAY COMMENT ABOUT A LOW TRANSMISSION FLUID LEVEL OR THAT THE TRANSFER CASE FLUID IS OVERFILLED. IN SOME CASES, THERE MAY BE NO EXTERNAL LEAKS APPARENT. ON VEHICLES EQUIPPED WITH AN AUTOMATIC TRANSMISSION, SOME OWNERS MAY COMMENT ABOUT DELAYED ENGAGEMENT OR TRANSMISSION NOT SHIFTING PROPERLY.

CAUSE:

THE ABOVE CONDITIONS MAY BE CAUSED BY A DAMAGED TRANSFER CASE INPUT SEAL. THIS SEAL DAMAGE MAY ALLOW TRANSMISSION FLUID TO ENTER THE TRANSFER CASE.

CORRECTION:

REPLACE THE TRANSFER CASE INPUT SHAFT SEAL AND INSPECT THE TRANSFER CASE INPUT GEAR FOR POSSIBLE SIGNS OF DAMAGE SUCH AS ROUGHNESS, SCRATCHES, OR DENTS. ALSO, INSPECT ANY SEALS TAKEN FROM DEALER INVENTORY FOR SIGNS OF CUT OR DAMAGED SEALING LIPS. VERIFY THAT THE TRANSMISSION FLUID AND TRANSFER CASE FLUID ARE AT THE PROPER LEVELS. CORRECT AS NECESSARY. REFER TO SECTION 4 - DRIVELINE/AXLE IN THE APPROPRIATE SERVICE MANUAL. USE THE PART NUMBER LISTED BELOW.

PARTS INFORMATION:

P/N DESCRIPTION QTY --- ----------- --- 14095609 SEAL, TRANSFER CASE INPUT SHAFT 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION DESCRIPTION LABOR TIME --------- ----------- ---------- K4250 GASKET, TRANSFER CASE USE PUBLISHED TO ADAPTER - REPLACE LABOR OPERATION TIME

IMPORTANT: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE WARRANTY SYSTEM.

FIGURES: 00 ATTACHMENTS: 00

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.