GM 26056795
Axle Shaft, Front

The first step to replace the propeller shaft on the front axle for all models except np8 is to raise the whole vehicle and remove the front differential carrier cover if it's there. Each driveline element such as the propeller shafts, axles, pinion and output shafts, needs to be marked so that they all go back in the same order after removal. First, tag which bolts are connected to the front axle and the transfer case flange and then remove all the bolts and retainers from these parts. Keep the injection joints safe by not banging on the yoke ears and making sure to avoid using any tool in that space. Gently remove the propeller shaft, move it forward to open up and afterward move it backward, making sure not to let the bearing cap go. After using an approved solvent to clean up the parts, look at the splines, universal joint bearings and propeller shaft to see if anything is wrong. For the installation, bring the propeller shaft out completely and then pull it back in around half its original stroke. Put the propeller shaft on the front axle by matching the references you made earlier, then put in the retainers and bolts and lock them with 20 nm (15 ft. Lbs.) of tightness. The next step is to install the propeller shaft into the transfer case, fix the reference marks, change the length and prop the shaft before putting in the retainers and bolts, tightening them to 20 nm (15 ft. Lbs.). If the shield is available, put it back on the front differential. Whenever the slip spline appears corroded or dry, disconnect the propeller shaft before you clean it. Lastly, keep applying the chassis lubricant to the slip spline grease fitting until you see grease appearing through the vent hole.

The proper replacement of a one-piece propeller shaft requires initial accurate markings of all driveline components relative to the propeller shaft and axles before disassembly. Following this step will allow for correct reinstallation of all components into their original positions along with compliance with published specifications and torque values. Place the vehicle on a hoisting system to start the work. Make permanent markings on the propeller shaft connection to the pinion flange and on the Slip Yoke to the transmission because these markings ensure proper reinstallation positions. Break the bolts and the yoke retainers off from the pinion flange. It is imperative to avoid striking the propeller shaft yoke ears or inserting a tool between the yoke and Universal Joint. The propeller shaft removal needs to start with sliding the shaft forward followed by lowering it before avoiding excessive incline to prevent joint fracturing. Before assembly use approved solvent to clean all parts while inspecting for burrs on the transmission yoke's outer diameter and Slip Yoke spline wear and Universal Joint bearing condition requiring replacement when necessary. To install the propeller shaft spray chassis grease onto the slip joint spline before aligning marks on the Slip Yoke to the transmission and pinion flange to the propeller shaft. Use yoke retainers along with bolts before lowering the vehicle. The procedure requires tightening yoke retainer bolts to 25 nm (19 ft. Lbs.).

Begin by raising the vehicle and supporting it with safety stands.

To ensure they are reassembled in the same relationship.

Install the wheel and tire assembly, and lower the vehicle.

Place the axle shaft with RTV or the gasket, ensuring the shaft splines mesh into the differential side gear.

Slide the propeller shaft rearward enough to disengage it, avoiding any pounding on the yoke ears.