GMC 20912713 Propeller Shaft Assembly

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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.

Raising the vehicle and supporting it on jackstands, with the front wheels blocked, would remove the rear driveshaft. In order to reinstall in the same position reference marks should be made on the driveshaft and pinion flange and ensure that the transmission is in Neutral with the parking brake off. The drive shaft should be lowered by removing its back u-joint bolts and retainers then slid out of transfer case or transmission. When installing, slide front end into transmission or transfer case then raise rear into position with marks aligned. Afterward, all bolts must be tightened to their proper torque specifications and clamps used to secure bearing caps. For 4WD models' front drive shaft, raise vehicle using jack stands after removal of differential carrier splash shield if any. The boot at the transfer case output shaft should be disengaged and relationship between driveshaft and companion flange marked for future reference. Thereafter disconnect bolts as well as clamps from differential flange while pushing driveshaft toward rear so that it can be separated from this flange before lowering it down to pull out of transfer case. To install, insert a sliding shaft that has splines at its rear through transfer case's output ends while aligning marks attached to them with those found on companion flange's front end. Install clamps together with bolts tightly according to specified torque values whereas push up boot over groove of transfer case output shaft where new clip will have been crimped into place subsequently using clamp-crimping pliers for reinforcement purposes. Lastly, splash shield of front differential carrier should be installed back there again.

The front differential carrier splash shield should be installed.

The vehicle must be raised and supported on jackstands, with the front wheels blocked. The transmission should be in Neutral with the parking brake off, and reference marks made on the driveshaft and pinion flange to ensure reinstallation in the same position.

The vehicle must be raised and supported on jackstands, with the front wheels blocked. The transmission should be in Neutral with the parking brake off, and reference marks made on the driveshaft and pinion flange to ensure reinstallation in the same position.

The driveshaft assembly requires little service.