GMC 25787946 Propeller Shaft Assembly

The first step to removing the rear driveshaft is to raise the vehicle and firmly support it on jackstands. The transmission should be placed in Neutral with the parking brake off and the front wheels blocked. Mark reference points on the driveshaft so that they align with those on the pinion flange. Use a screwdriver or prybar to undo the bolts and straps of the rear universal joint, thereby preventing it from turning. Since there may be splines inside the spider, tape its bearing caps down. Similarly, if applicable remove support bearing mounting bolts. Slide it out of the transmission or transfer case while lowering the back end of the drive shaft. Put a plastic bag over housing to prevent fluid loss/contamination. Remove this plastic bag upon installation and wipe clean. Insert front part of driveshaft into transmission or transfer case, while raising rear one ensuring marks are aligned. Remove tape securing bearing caps and install straps and bolts tightening them to specified torque values. For 4WD models' front driveshaft; raise vehicle's front part & take off skid plate where present; mark relationship between driveshaft & companion flange at forward differential & transfer case flange; remove strap & bolt from differential flange as well as those fastening driveshaft to transfer case flange; push rearwards drive shaft from differential flange then lower & pull out from transfer case; after installing ensure rear is properly aligned with marks made on companion flange at front differential as well as transfer case flange at back; tighten all couplings using defined levels of torque; and finally install skid plate if available.

Problems with the driveshaft are usually indicated by noise or vibration while driving.

Make sure the retaining ring is in position on the end of the intermediate shaft.

Before installing the rear driveshaft, you should remove the plastic bag, clean the area, and slide the front of the driveshaft back into the transmission or transfer case.

During inspection, the driveshaft should be visually checked for dents or cracks, and for oil leakage at the front and rear. The universal joints should be checked for proper operation without binding, noise, or looseness. The driveshaft mounting bolts should also be checked.

Attach a slide hammer to the adapter.