DRIVELINE SHUDDER/VIBRATION PROCEDURE INFORMATION. GMC Truck S15 Pickup - 2WD 1982

For 1990-2009 cars

# DRIVELINE SHUDDER/VIBRATION PROCEDURE INFORMATION

SOME 1982 "S" TRUCKS, LONG WHEEL BASE MODELS WITH TWO-PIECE PROPSHAFTS, BUILT PRIOR TO NOVEMBER 15, 1981 MAY EXHIBIT A SHUDDER OR VIBRATION DURING MEDIUM AND HEAVY ACCELERATION FROM APPROXIMATELY 5-20 MPH. TO MINIMIZE THIS CONDITION, AN INTERIM PRODUCTION CHANGE WAS INITIATED THAT ALIGNS THE FRONT AND REAR PROPSHAFT SLIP YOKES WITH EACH OTHER (FIGURE 1). THE DRIVELINE SHUDDER OR VIBRATION CAN BE SIGNIFICANTLY REDUCED BY REINDEXING THE REAR PROPSHAFT 90F FOLLOWING THE PROCEDURE NOTED BELOW: (1) REMOVE REAR PROSHAFT ASSEMBLY. (2) USING A SUITABLE GRINDING TOOL OR FILE, REMOVE THE WELD WHICH BRIDGES THE GAP BETWEEN TWO (2) OF THE MALE SPLINES OF THE FRONT PROPSHAFT ASSEMBLY. SEE FIGURE 1, LOCATION "A" AND FIGURE 2. (3) REINSTALL REAR PROPSHAFT ASSEMBLY BEING SURE TO CORRECTLY ALIGN THE SLIP YOKES AS ILLUSTRATED IN FIGURE 1. ILLUSTRATION

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