GM 15815724 Axle Assembly, Rear (3.73 Ratio)

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The initial steps to remove and install components in the front differential of selectable 4WD systems are as follows: Loosen the wheel lug nuts. Raise the vehicle securely on jackstands. Remove the right front wheel. Remove the differential carrier splash shield if equipped. Drain the lubricant from the front differential. For 4WD systems, unbolt the right driveaxle from the axleshaft flange and support it out of the way. Remove the front axle shift motor and, if applicable, disconnect the front stabilizer link or remove the front shock absorber/coil spring assembly. On 2500/3500 models, remove the front axle bracket bolts and slide the bracket forward for additional clearance. Support the differential carrier with a floor jack and a block of wood.

Yes, there is an optional locking limited-slip rear axle available.

The optional locking limited-slip rear axle slows the rotation of the differential case when one wheel loses traction.

The final step is to tighten the wheel lug nuts to the proper torque specifications.

To install the semi-floating axle shaft, you should insert the axleshaft into the housing until it engages with the differential side gear, install the C-lock, and insert the pinion shaft. Then, install the cover, fill the differential with lubricant, and install the brake disc or drum.

Power is transmitted through a pair of driveaxles equipped with sliding constant velocity (CV) joints capable of both angular and axial motion.

The inner ends of the driveaxles are bolted to an axleshaft connected to the differential side gears.

To remove and install components in the front differential for 4WD systems, follow these steps: Remove the bolts securing the axle tube to the differential carrier and the nuts attaching the tube to its support bracket. Carefully remove the output shaft tube, ensuring no components fall out. Mount the tube in a vise and remove the internal components. Measure and remove the axleshaft bearing using a slide hammer and bearing remover attachment. For installation, install the bearing to the original depth using a bearing driver or socket, then install a new seal and deflector, lubricating the seal lips with grease. Carefully drive in the axleshaft, followed by the internal components. Apply RTV sealant to the tube-to-differential housing mating surface, and install the tube assembly, tightening bolts and nuts to specified torques. Reinstall the driveaxle, front axle shift motor, and fill the differential with lubricant.

Before removing the rear axle assembly, the following components need to be removed: driveshaft, shock absorbers, vent hose, brake hose, rear brake assemblies, parking brake cables, and rear wheel speed sensors.

To install the rear axle assembly, the reverse order of removal should be followed. All suspension and brake fasteners should be tightened to the torque value specifications.

To remove the axle shaft on a vehicle, first loosen the wheel lug nuts, raise the front of the vehicle, and support it securely on jackstands. Pry off the hub cover and remove the axle shaft/hub nut, bracing the hub to prevent it from rotating. Remove the differential carrier splash shield if equipped, and then remove the axle shaft-to-axle shaft flange bolts, having an assistant apply the brake to prevent the axle shaft from turning. Lower the inner end of the axle shaft and pull the stub shaft out of the hub, carefully guiding the axle shaft out from under the vehicle. To install the axle shaft, lubricate the splines on the stub shaft with multi-purpose grease before tightening the axle shaft/hub nut (new) and the flange bolts to the torque values specifications. Finally, tighten the wheel lug nuts to the proper torque specifications.

For models with a locking differential, you should rotate the differential until the shaft touches the case for access to the C-locks.