TRANSFER CASE HOPS OUT OF 4 - LOW

SUBJECT: TRANSFER CASE HOPS OUT OF 4-LOW (REPLACE WITH REVISED DETENT LEVER)

MODELS: 1989-95 CHEVROLET AND GMC TRUCK K3 MODELS WITH BORG-WARNER 1370, 4401 OR 4470 TRANSFER CASE

CONDITION:

SOME VEHICLES MAY EXPERIENCE A CONDITION OF THE TRANSFER CASE HOPPING OUT OF 4-LOW.

CAUSE:

THIS CONDITION MAY BE CAUSED BY AN INCORRECTLY ADJUSTED TRANSFER CASE SHIFT LINKAGE OR LOW DETENT LOADS AT THE TRANSFER CASE SHIFT DETENT LEVER.

CORRECTION:

INSPECT AND ADJUST THE TRANSFER CASE SHIFT LINKAGE AS DETAILED IN THE APPROPRIATE C/K SERVICE MANUAL, SECTION 7D, TRANSFER CASE LINKAGE ADJUSTMENT. IF, AFTER PROPERLY ADJUSTING THE LINKAGE, THE TRANSFER CASE CONTINUES TO HOP OUT OF 4-LOW, THE TRANSFER CASE SHIFT DETENT LEVER (FIGURE 1, #38) SHOULD BE REPLACED WITH A REVISED SHIFT DETENT LEVER. THIS REVISED SHIFT DETENT LEVER HAS A DEEPER 4-LOW DETENT NOTCH TO PREVENT 4-LOW HOP OUT.

THE REVISED SHIFT DETENT LEVER ENTERED PRODUCTION NOVEMBER 1994 FOR 1995 MODEL YEAR BORG-WARNER 4401 AND 4470 TRANSFER CASE ASSEMBLIES. THE REVISED TRANSFER CASE ASSEMBLIES ARE IDENTIFIED BY BORG-WARNER AUTOMOTIVE P/N'S 4401-015, 4401-016 OR 4470-012. SEE FIGURE 2 FOR IDENTIFICATION TAG INFORMATION.

SERVICE PROCEDURE

FOR TRANSFER CASE REMOVAL AND REPLACEMENT REFER TO THE APPROPRIATE C/K SERVICE MANUAL, SECTION 7D, TRANSFER CASE REPLACEMENT. REFER TO THE APPROPRIATE LIGHT DUTY TRUCK UNIT REPAIR MANUAL FOR SHIFT DETENT LEVER REPLACEMENT.

SERVICE PARTS INFORMATION

P/N DESCRIPTION QTY 15997312 TRANSFER CASE SHIFT DETENT LEVER, 1989-93 1 15997313 TRANSFER CASE SHIFT DETENT LEVER, 1994-95 1

PARTS ARE EXPECTED TO BE AVAILABLE FROM GMSPO ON 11/28/94.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME K4400 TRANSFER CASE ASSEMBLY - RECONDITION USE PUBLISHED LABOR OPERATION TIME

FIGURES: 2

CAPTIONS: FIGURE 1 - BORG-WARNER TRANSFER CASE COMPONENTS FIGURE 2 - BORG-WARNER TRANSFER CASE IDENTIFICATION

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.

COPYRIGHT 1994 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.