GMC 25843685 Front Axle Propeller Shaft Assembly

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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.

A drive shaft is a tube that carries power between the transmission or transfer case and the differential. There are universal joints on either end of the rear drive shaft and on the front end of the front drive shaft. The front of the rear drive shaft has a splined yoke that slides into the extension housing of the transmission or transfer case, permitting it to be moved back and forth during vehicle operation. An oil seal prevents this leakage. Very little maintenance is required for the drive shaft assembly, but it may become necessary to replace universal joints if they develop problems. Drive shafts should be kept clean and checked for damage. Driving noise or vibration usually reveals issues with this part. When inspecting, look at its surface for dents or cracks, as well as for oil leakage from both ends. The U-joints should have free play without binding, rattling or rocking in them. Make sure you also tighten up all bolts securing the driveshaft in place. On 4WD models, check out the front driveshaft too including any seepage around its sleeve yoke. Looseness in the jointity of front driveaxles can be determined by checking; also look for grease or oil leaks emanating from rubber boots as well as axle flanges.

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.

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.