SMU - SECTION 4A - ' PROPELLER SHAFT'. GMC Truck GMC K Pickup

SUBJECT: SERVICE MANUAL UPDATE - SECTION 4A - "PROPELLER SHAFT"

MODELS: 1995 CHEVROLET AND GMC TRUCK C/K MODELS

A CORRECTION TO SECTION 4A "PROPELLER SHAFT" OF THE 1995 C/K TRUCK SERVICE MANUAL HAS BEEN MADE. THE ART DEPICTING THE FRONT DRIVE PROPELLER SHAFT CONNECTING TO THE TRANSFER CASE AND THE TORQUE CALLOUT HAS BEEN CHANGED. IN ADDITION, THE FASTENER TIGHTENING SPECIFICATION CHART HAS BEEN UPDATED TO REFLECT THE TORQUE CHANGE.

PROPELLER SHAFT REPLACEMENT (FRONT DRIVE)

**REMOVE OR DISCONNECT (FIGURE 1)**

* RAISE VEHICLE ON HOIST. * SKID PLATE (IF APPLICABLE). REFER TO SECTION 4C.

**IMPORTANT** * IT IS ESSENTIAL THAT THE POSITIONS OF ALL DRIVELINE COMPONENTS RELATIVE TO THE PROPELLER SHAFT AND AXLES BE OBSERVED AND ACCURATELY REFERENCE MARKED PRIOR TO DISASSEMBLY. THESE COMPONENTS INCLUDE THE PROPELLER SHAFTS, DRIVE AXLES, PINION FLANGES, OUTPUT SHAFTS, ETC. ALL COMPONENTS MUST BE REASSEMBLED IN THE EXACT RELATIONSHIP TO EACH OTHER AS THEY WERE WHEN REMOVED. IN ADDITION, PUBLISHED SPECIFICATIONS AND TORQUE VALUES, AS WELL AS ANY MEASUREMENTS MADE PRIOR TO DISASSEMBLY, MUST BE FOLLOWED. * REFERENCE MARK THE RELATIONSHIP OF THE PROPELLER SHAFT TO THE FRONT AXLE AND THE TRANSFER CASE.

1. BOLTS AND RETAINERS FROM FRONT AXLE. 2. BOLTS AND RETAINERS FROM TRANSFER CASE.

**IMPORTANT:** DO NOT POUND ON TO DISCONNECT.

3. PROPELLER SHAFT. * COMPRESS THE PROPELLER SHAFT FORWARD, ENOUGH TO DISENGAGE, THEN MOVE THE PROPELLER SHAFT REARWARD. * AVOID DROPPING CAP ASSEMBLIES FROM THE YOKE ENDS.

CLEAN

ALL PARTS WITH AN APPROVED SOLVENT.

INSPECT

* SPLINES FOR DAMAGE, WEAR, BURRS, AND TWISTING. * UNIVERSAL JOINT BEARINGS FOR WEAR. * PROPELLER SHAFT FOR ANY EVIDENCE OF DAMAGE.

**INSTALL OR CONNECT (FIGURE 1)** * EXTEND THE PROPELLER SHAFT TO ITS FULL LENGTH, THEN COMPRESS IT ABOUT HALF ITS STROKE. 1. PROPELLER SHAFT TO FRONT AXLE. * LINE UP THE REFERENCE MARKS MADE PREVIOUSLY. 2. RETAINERS AND BOLTS. TIGHTEN: * RETAINER BOLTS TO 20 N.M (15 LB FT). 3. PROPELLER SHAFT TO TRANSFER CASE. * LINE UP THE REFERENCE MARKS MADE PREVIOUSLY. * ADJUST THE PROPELLER SHAFT LENGTH. 4. RETAINERS AND BOLTS. TIGHTEN: * RETAINER BOLTS TO 20 N.M (15 LB FT). 5. SKID PLATE (IF APPLICABLE). REFER TO SECTION 4C.

SLIP YOKE SPLINES

APPLY CHASSIS LUBRICANT AT THE SLIP SPLINE GREASE FITTING UNTIL THE GREASE BEGINS TO LEAVE THROUGH THE VENT HOLE. IF THE SLIP SPLINE IS DRY OR CORRODED, IT MAY BE NECESSARY TO DISCONNECT THE PROPELLER SHAFT FROM THE VEHICLE, REMOVE THE SLIP YOKE, AND WIRE BRUSH THE AFFECTED AREA. WIPE CLEAN BEFORE INSTALLATION.

SPECIFICATIONS FASTENER TIGHTENING SPECIFICATIONS

APPLICATION N.M LB FT

ONE-PIECE PROPSHAFT REAR AXLE RETAINER BOLT C/K 15-25 ................................ 20 15 C/K 35 ................................... 20 15 TWO-PIECE PROPSHAFT - FRONT YOKE TO M40 TRANSMISSION ................... 120 90 TRANSMISSION YOKE RETAINER BOLT ............ 20 15 TRANSFER CASE YOKE RETAINER BOLT ........... 20 15 THREE-PIECE PROPSHAFT FRONT AXLE RETAINER BOLT INTERMEDIATE RETAINER BOLT REAR AXLE RETAINER BOLT C/K 35 ................................... 35 26 CENTER BEARING SUPPORT CROSSMEMBER MOUNTING NUT ................... 35 26 FRONT DRIVE PROPSHAFT FRONT AXLE RETAINER BOLT ................... 20 15 TRANSFER CASE RETAINER BOLT ................ 20 15

FIGURES: 1

CAPTION: FIGURE 1 - FRONT DRIVE PROPELLER SHAFT

Object Number: 83987 Size: FS

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.