EXCHANGE PROG. -NVG 136/246 AUTO FOUR WHEEL DRIVE. GMC Truck Yukon

REVISION: 11/13/97

THIS BULLETIN IS BEING REISSUED TO REVISE THE PROCEDURE AND CORRECT A PART NUMBER. PLEASE DISCARD CORPORATE BULLETIN NUMBER 76-74-01 (SECTION 7 - TRANSMISSION). ______________________________________________________________________

SUBJECT: EXCHANGE PROGRAM - NVG 136/246 AUTO FOUR WHEEL DRIVE TRANSFER CASE/MOTOR ENCODER/MODULE

MODELS: 1998 CHEVROLET AND GMC K MODELS 1998 OLDSMOBILE BRAVADA WITH NVG 136 AND 246 AUTOTRAC ACTIVE TRANSFER CASE

GM OF CANADA DEALERS AND NAES DEALERS ARE NOT AUTHORIZED TO UTILIZE THIS SERVICE BULLETIN, BUT MUST CONTACT THE TECHNICAL ASSISTANCE CENTRE PRIOR TO COMPONENT REPLACEMENT.

TO PROVIDE PRODUCT FEEDBACK, A PARTS RESTRICTION PROGRAM IS BEING IMPLEMENTED FOR THE 1998 NVG 136 AND NVG 246 AUTO FOUR WHEEL DRIVE TRANSFER CASE, MOTOR ENCODER AND MODULE ASSEMBLIES. THIS PROGRAM WILL END JULY 31, 1998. THE PROGRAM IS NOT OPTIONAL. ALL TRANSFER CASES, MOTOR ENCODERS AND MODULES REQUIRING REPAIR MUST BE OBTAINED THROUGH THE PROGRAM.

IMPORTANT: EXCHANGED TRANSFER CASES MUST NOT BE DISASSEMBLED AND MUST BE RETURNED AS A COMPLETE UNIT. DEALERSHIPS RETURNING A TRANSFER CASE, EVEN PARTIALLY DISASSEMBLED, WILL BE SUBJECT TO BEING BILLED FOR THE TRANSFER CASE.

PROCEDURE

1. CONTACT YOUR DIVISION TECHNICAL ASSISTANCE GROUP WITH DETAILS OF THE CONCERN. TECHNICAL ASSISTANCE WILL OPEN A CASE AND CONTACT NEW VENTURE GEAR (NVG) WHO MAY THEN ASSIST IN DIAGNOSIS. IF A PART IS DETERMINED NECESSARY, IT WILL BE SENT OVERNIGHT AND WILL BE INVOICED TO DEALERS VIA GM SERVICE PARTS OPERATIONS (GMSPO). PREMIUM SHIPPING COSTS WILL BE PAID BY GMSPO. REPLACEMENT TRANSFER CASES WILL BE SHIPPED FILLED WITH FLUID BUT, FLUID LEVEL SHOULD BE CHECKED PRIOR TO OPERATION. 2. WHEN THE EXCHANGED PART IS RECEIVED, THE REPLACEMENT UNIT MUST BE RETURNED WITHIN 21 DAYS AFTER RECEIPT OF THE WPC REQUEST FOR PART TO AVOID A CHARGE-BACK. RETURN SHIPPING INFORMATION WILL BE INCLUDED WITH THE NEW TRANSFER CASE. 3. REPLACEMENT TRANSFER CASES MUST BE RETURNED COMPLETE AS REMOVED FROM THE VEHICLE. IT MUST NOT BE DISASSEMBLED AT ANY TIME BEFORE RETURN. DEALERSHIPS RETURNING UNITS EVEN PARTIALLY DISASSEMBLED WILL BE SUBJECT TO BILLING FOR THE TRANSFER CASE.

PREPARATION FOR SHIPPING 1. DRAIN ALL OIL FROM THE TRANSFER CASE. 2. REMOVE ALL PLASTIC SHIPPING PLUGS AND COVERS FROM THE REPLACEMENT TRANSFER CASE AND INSTALL THEM ON THE REPLACED TRANSFER CASE. 3. PLACE A COPY OF THE REPAIR ORDER AND THE WPC REQUEST IN THE PLASTIC BAG AND ATTACH THE BAG TO THE COMPLAINT TRANSFER CASE. DO NOT SHIP ANY PART BEFORE RECEIPT OF THE WPC REQUEST FOR PART.

4. PACK THE REPLACED TRANSFER CASE INTO THE ORIGINAL SHIPPING CONTAINER AND RETURN TO THE FOLLOWING ADDRESS. GM WARRANTY PARTS CENTER 45 NORTHPOINTE DRIVE ORION, MI 48359

IMPORTANT

REFER TO WARRANTY ADMINISTRATION BULLETIN 40-05-01B, DATED SEPTEMBER 1997, FOR SHIPPING INSTRUCTIONS.

THIS TRANSFER CASE USES AUTOMATIC TRANSMISSION FLUID DEXRON(R)III (PART NUMBER 12346143). DO NOT SUBSTITUTE ANY OTHER FLUID.

MOTOR ENCODERS AND MODULES MUST ALSO BE RETURNED TO THE GM WARRANTY PARTS CENTER.

PARTS INFORMATION

THE FOLLOWING PARTS CAN BE OBTAINED ONLY BY CONTACTING YOUR DIVISIONAL TECHNICAL ASSISTANCE GROUP.

P/N DESCRIPTION QTY 15004509 TRANSFER CASE ASSY (BRAVADA) 1 15007093 TRANSFER CASE ASSY (K-4L60-E) 1 15007094 TRANSFER CASE ASSY (K-4L80-E) 1 12547470 MOTOR ENCODER ASSY (BRAVADA) 1 12547658 MOTOR ENCODER ASSY (K MODEL) 1 15002016 MODULE ASSY (BRAVADA) 1 15001809 MODULE ASSY (K MODEL) 1 12346143 A/T FLUID, DEXRON(R)-III, 1 QT. AS REQUIRED

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION

ALL PARTS OBTAINED THROUGH THIS PROGRAM WILL BE BILLED DIRECTLY TO DEALERS VIA GMSPO. DEALERS SHOULD SUBMIT A CLAIM INCLUDING LABOR, PARTS AND 40% PARTS HANDLING ALLOWANCE.

USE THE APPROPRIATE LABOR OPERATION LISTED BELOW.

LABOR OP DESCRIPTION LABOR TIME OTHER LABOR HRS

K4410 TRANSFER CASE USE PUBLISHED ADD 0.2 HR FOR ASSEMBLY - REPLACE LABOR OPERATION ADMINISTRATIVE K4124 MOTOR, TRANSFER CASE TIME TIME ENCODER - REPLACE K4122 MODULE, TRANSFER CASE SHIFT - REPLACE

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

FIGURES: 0

CAPTIONS: 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.