GM 84675736 Shaft Assembly, Prop

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Before we proceed to the removal of the driveshaft, we have to lift the car properly above the ground on the help of jackstands. One must use some chalk or a scribe to mark the relative position of the driveshaft to the flange or the yoke which is on the differential axle assembly so that it may again be properly aligned. Then, on one end undo the bolts which hold driveshaft flange or universal joint clamps on the differential pinion flange or yoke, depending on the vehicle while using the screwdriver or pry bar to hold the shaft to avoid rotating. Secure the position of the transmission to the slip yoke and using the prying tool separate the universal joint from its flange or yoke carefully, especially because the caps can fall off thus dropping the needle bearings. Lower the rear of the driveshaft half and wind the tape round the universal joint bearings at the axle end so that they will stay on when the front of the driveshaft is slidden out of the transmission. For installation, the process is a reverse of the removal steps; where upon occasion it might not be possible to align the shaft due to rotation of the differential or transmission components, then the vehicle has to be put in Neutral or one wheel is spun to bring back the right alignment. The caps of the universal joint have to be correctly placed on the flange or yoke, and fasteners need to be tightened up to the desired torque.

The driveshaft is finely balanced during manufacture, and maintaining this balance is crucial when replacing universal joints.