GMC 15757017 Shaft Assembly, Front & Rear Propeller

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A driveshaft is a tube or pair of tubes that transmits power between the transmission and differential, with universal joints located at either end and in the center of two-piece driveshafts. Single piece driveshafts have a splined yoke at the front that allows for movement during vehicle operation, while two-piece driveshafts have a slip joint on the front of the rear section and a center support bearing. The driveshaft assembly requires little service, with universal joints lubricated for life and replaced if problems arise. Inspection involves checking for dents, cracks, and oil leakage, as well as ensuring proper operation of universal joints and center bearings. Driveshaft mounting bolts should also be checked for tightness, and similar checks should be performed on the front driveshaft and driveaxles of 4WD models. Noise or vibration while driving may indicate problems with the driveshaft or other components.

The rear universal joint bolts and retainers should be removed, and the driveshaft lowered and slid out of the transmission or transfer case.

The vehicle should be raised and supported on jackstands, with the differential carrier splash shield removed if equipped. The boot at the transfer case output shaft should be disengaged and the relationship of the driveshaft to the front differential companion flange marked. The bolts and clamps should be removed from the differential flange, and the driveshaft pushed to the rear and separated from the flange before being lowered and pulled out of the transfer case.