GM 26056508 Propeller Shaft Assembly

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If the transmission or transfer case end has a splined yoke, cover it with a plastic bag to prevent fluid loss and contamination.

A drive shaft is a tube or set of tubes that transfers power between either the transmission or the transfer case on 4WD models and the differential. Universal joints are positioned at each end of the driveshaft as well as in the center of two-piece driveshafts. On 2WD models, their driveshafts have a front splined yoke that slips into the transmission extension housing so that their length can increase and decrease. An oil seal prevents leakage at this point. Driveshafts on 4WD models tend to come with a splined yoke / companion flange at the transfer case end while two-piece driveshafts typically sport a slip joint at the front of the rear section. Center bearings carry the driveline when two-piece driveshafts are used. It's not often you need to service a drive shaft assembly but if anything goes wrong, replace worn universal joints since they have had to be greased for life. The drivshaft must be cleaned and checked for damage whenever lifting vehciles during servicing, ensuring that small weights used in balancing it do not detach. In most instances, noise or vibration when driving signifies trouble in the drivshaft whereas road testing can clarify whether this is right.