WARRANTY ADMIN. - WARRANTY LABOR OPERATION NUMBER & TIME. GMC Truck GMC MD Steel Tilt 67.2" 1988

SUBJECT: WARRANTY ADMINISTRATION -- WARRANTY LABOR OPERATION NUMBER AND TIME ALLOWANCE FOR ON-VEHICLE REPAIR TO THE JATCO AUTOMATIC TRANSMISSION

MODELS: 1988-96 CHEVROLET TILTMASTER AND GMC FORWARD W4 MODELS WITH JATCO AUTOMATIC TRANSMISSION

********************************************************************** IMPORTANT: 'GM OF CANADA' AND 'NAES' DEALERS ARE NOT AUTHORIZED TO UTILIZE THIS SERVICE BULLETIN. **********************************************************************

DIAGNOSIS AND REPAIR INFORMATION FOR THE JATCO AUTOMATIC TRANSMISSION CAN BE FOUND IN THE JATCO AUTOMATIC TRANSMISSION TECHNICIAN GUIDE (NPR96-TTG-C01), ALONG WITH THE APPLICABLE W4 SERVICE MANUAL SECTION 7A. THE JATCO AUTOMATIC TRANSMISSION TECHNICIAN GUIDE IS GIVEN TO TECHNICIANS THAT ATTEND THE JATCO TJT96 CLASS HELD BY ISUZU. THE GUIDE ALSO MAY BE ORDERED FROM HELM AT 1-800- 782-4356.

WHEN DIAGNOSIS INDICATES THAT AN AUTOMATIC TRANSMISSION RELATED FAULT IS CAUSED BY ANY OF THE COMPONENTS LISTED IN THE "OPERATION" COLUMN BELOW, REPAIR OR REPLACEMENT OF THAT COMPONENT SHOULD BE MADE.

IMPORTANT: REPAIRS LISTED IN THIS SERVICE BULLETIN DO NOT REQUIRE REPLACEMENT OF THE COMPLETE TRANSMISSION ASSEMBLY.

LABOR TIME GUIDE INFORMATION

FOR JATCO AUTOMATIC TRANSMISSION REPAIR, USE THE FOLLOWING ON VEHICLE LABOR OPERATIONS:

OPERATION OPERATION TASK TIME ADDITIONAL NUMBER INSTRUCTIONS SWITCH, IDLE J6550 R + R 0.3 SWITCH, KICKDOWN J6560 R + R 0.3 SENSOR, THROTTLE J6374 R + R 0.6 POSITION ADD: 1.2 `95.5 - ON (TPS) J6375 ADJUST 0.2 ADD: 0.3 `95.5 - ON CABLE AND/OR SHIFT K5170 R + R 0.7 LEVER, CONTROL ADD: 0.2 `95.5 - ON K5171 ADJUST 0.3 SWITCH, TRANSMISSION K6275 R + R 0.3 INHIBITOR K6274 ADJUST 0.2 SENSOR, TRANSMISSION K6304 R + R 0.2 SPEED SENSOR, ENGINE SPEED J6540 R + R 0.5 SENSOR, VEHICLE K6310 R + R 0.6 SPEED CONVERTER ASSEMBLY, K7020 REPLACE 3.9 TRANSMISSION SEAL, TRANSMISSION K7100 REPLACE 4.1 INCLUDES R + R OIL PUMP TORQUE CONVERTER SEAL, EXTENSION K6360 R + R 1.2 HOUSING REAR PAN AND/OR GASKET, K6500 R + R 0.8 TRANSMISSION OIL FILTER, VALVE BODY K6568 R + R 1.7 OIL VALVE BODY K6560 R + R 1.5 ADD: 0.5 CLEANING SOLENOIDS, A/B SHIFT K6523 R + R 1.6 SHAFT AND/OR SEAL, K6501 R + R 1.8 MANUAL (MANUAL LEVER SEAL) WIRING HARNESS K6551 REPAIR 0.5 HARNESS ASSEMBLY K6554 REPLACE 1.0 COVER AND/OR GASKET, K6280 R + R 0.5 PTO

LABOR TIMES INCLUDE 0.1 ADMINISTRATIVE TIME ALLOWANCE.

FIGURES: 0

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.