GM 25843685 Front Axle Propeller Shaft Assembly

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When installing the rear driveshaft, raise the rear into position, ensuring the marks on the driveshaft and pinion flange are aligned. Remove the tape securing the bearing caps and install the straps and bolts, tightening them to the specified torque.

On 4WD models, the front driveshaft should be checked as well, including for leakage around the sleeve yoke. The joints of the front driveaxles should be checked for looseness, and for grease or oil leakage from the rubber boots and axle flanges.

Loosen the left front wheel lug nuts, raise the vehicle, place it securely on jackstands and remove the left front wheel. Remove the splash shield. Remove the left driveaxle and intermediate shaft bearing housing. Thread a slide hammer adapter into the hole in the end of the intermediate shaft. Attach a slide hammer to the adapter. Pull the intermediate shaft out of the differential, taking care not to damage the seal on the opposite side of the oil pan. Make sure the retaining ring is in position on the end of the intermediate shaft. Insert the intermediate shaft through the oil pan passage and into the differential, taking care not to damage the oil seal. Rotate the shaft as necessary to align its splines with the differential. Install the slide hammer on the shaft, then use the slide hammer to drive the shaft In until its retaining ring locks into place in the differential. The remainder of installation is the reverse of the removal steps.

To complete the removal and installation of the front driveshaft on 4WD models, you should remove the bolts and straps from the differential flange and the bolts securing the driveshaft to the transfer case flange. Push the driveshaft to the rear to separate it from the differential flange, then lower and pull it out of the transfer case. When installing, attach the front end of the shaft to the differential companion flange and the rear to the transfer case flange, ensuring the marks are aligned. Install the straps and bolts, tightening them to the specified torque. Finally, install the skid plate if applicable.

A driveshaft is a tube that transmits power between the transmission or transfer case and the differential. Universal joints are located at either end of the rear driveshaft and at the front end of the front driveshaft. The rear driveshaft has a splined yoke at the front that slips into the extension housing of the transmission or transfer case, allowing it to slide back and forth during vehicle operation. An oil seal prevents leakage at this point. The driveshaft assembly requires little service, but the universal joints may need to be replaced if problems develop. The driveshaft should be kept clean and inspected for damage. Problems with the driveshaft are usually indicated by noise or vibration while driving. 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. On 4WD models, the front driveshaft should be checked as well, including for leakage around the sleeve yoke. The joints of the front driveaxles should be checked for looseness, and for grease or oil leakage from the rubber boots and axle flanges.