The drive shaft is of significant importance, as it transmits power between the transmission or transfer case (on 4WD models) and the differential and is characterized by universal joints at each end and a centre support bearing in the event of a two-piece drive-shaft. In the single piece rear drive shafts, the one at front has a splined yoke that connects to either the transmission or else the transfer case while the rear portion possesses a splined yoke that joins the front section, allowing for suspension changes. The two-piece rear driveshaft model has a center support bearing attached to a frame crossmember. Because of suspension movement, the 4WD front driveshaft contains a slip joint. When problems occur throughout their service lives, drive-shafts typically require little servicing, as they contain permanently lubricated universal joints that need to be replaced only after issues have been identified which necessitates removal of this part for servicing. Take good care to balance accurately without any debris being stuck on it while balancing weights should be secure. As soon as noise or vibration is noticed during driving, an immediate attention is needed including road testing for confirmation. Do not forget to inspect the driveshaft for dents or cracks under proper vehicle raising conditions plus both ends must be checked for oil leaks during servicing. While doing this check ensure smooth operation of universal joints with no binding noises or looseness; examine center bearing in terms of wear which might affect it plus rubber section for cracks. Try to twist or lift it up so as to ascertain whether there is any movement hence verify that there is no disintegration within universal joint(s). Finally check whether driveshaft mounting bolts are tight enough also. For 4WD models perform these checks again but on front driveshaft including checking slip yoke for leaks too. Also scrutinize all connections from driveshafts into transfer case and front differential input where oil sealings get outworn as well as front drive axle joints tend to get loose with grease and oil leakage from rubber boots.