STEERING WANDER (RESET ALIGN ADJ.REP. STEERING GEAR). GMC Truck Yukon

SUBJECT: STEERING WANDER (RESET ALIGNMENT, ADJUST/REPLACE STEERING GEAR)

MODELS: 1997 CHEVROLET AND GMC C/K MODELS EXCLUDING 3500 HD

CONDITION:

AN OWNER MAY COMMENT ABOUT STEERING WANDER OR THE PERCEPTION OF LOOSE STEERING AT HIGHWAY SPEEDS

CORRECTION:

FOLLOW THE STRATEGY BASED DIAGNOSTIC STEPS FOR THE CONDITION USING THE SERVICE MANUAL, SECTION 3B5, SPEED DEPENDENT STEERING, DIAGNOSIS SYSTEM CHECK. PERFORM THE FRONT WHEEL ALIGNMENT PRELIMINARY INSPECTIONS IN SECTION 3A-2. VERIFY THAT THE FRONT SUSPENSION "Z" DIMENSION IS WITHIN SPECIFICATIONS PER THE TRIM HEIGHT CHART ON PAGE 3A-4.

DISCONNECT THE LEFT AND RIGHT TIE ROD ENDS AND CHECK FOR TIGHT OR BINDING BALL JOINTS AND THAT THEY ARE PROPERLY LUBRICATED. IF ALL COMPONENTS AND SPECIFICATIONS ARE CORRECT, ADJUST THE FRONT WHEEL ALIGNMENT TO THE FOLLOWING SPECIFICATIONS.

CASTER 3.80 TO 3.90 DEGREES

CAMBER 0.5 DEGREES +/- 0.5 DEGREES

SUM TOE-IN .24 DEGREES +/- 0.2 DEGREES

IF CONDITION PERSISTS, - ON VEHICLES BELOW 8050# GVW, ADJUST THE STEERING GEAR SPOOL VALVE PRELOAD AND SECTOR PRELOAD FOLLOWING THE PROCEDURE DESCRIBED IN SECTION 3B1A. - ON SUBURBANS EQUIPPED WITH 6.5L DIESEL ENGINE, UNDER 8600# GVW, BUILT PRIOR TO MARCH 5, 1997, REPLACE THE STEERING GEAR WITH P/N 26068771 AND THE EVO MODULE, P/N 16259515. - ON VEHICLES ABOVE 8500# GVW, REPLACE ONLY THE STEERING GEAR WITH P/N 26068771.

PARTS INFORMATION:

P/N DESCRIPTION QTY 26068771 STEERING GEAR 1 16259515 MODULE, EVO 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME E2020 WHEEL ALIGNMENT - CHECK AND/OR ADJUST USE PUBLISHED E9700 GEAR ASSEMBLY, POWER STEERING - ADJUST LABOR OPERATION E9740 GEAR ASSEMBLY, POWER STEERING - REPLACE TIME E8438 CONTROLLER, EVO - REPLACE E9995 TO CHECK BALL JOINT STIFFNESS IF NO TROUBLE FOUND

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

FIGURES: 0

CAPTIONS: 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.