What are the key inspection and maintenance steps for a driveshaft and Universal Joints, and what signs indicate potential issues on Nissan Murano?

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In these vehicles, the driveshaft comprises of two tubes, which transmit power from the transfer case to the rear differential; at the extremity of the tubes, standard universal joints are employed; in the middle, a constant velocity joint that is overlaid with a bearing is installed. This assembly is virtually self-service since the universal joints are supplied with lubricant for the life of the assembly and if, for some reason a part fails, the only solution is replacement of the entire driveshaft although some specialty shops may offer rebuilding services. The driveshaft must be cleansed and should not have any traces of undercoating or mud; checking for damages when the car is in the raised position for service, see that the tiny balancing weights are also intact. Most problems are identified in terms of noise or vibration, and this can be tested while on the road. To examine the driveshaft safely get the car off the ground using jackstands, Also lock the wheels, disengage the parking brake and shift the transaxle to Neutral. Check for any dents or cracks on the drive shaft and if the situation is severe go for a new drive shaft. Look for signs of oil leak from the front and rear area, it is a sign of a bad seal and check for the rear driveaxles joint for looseness. Turn the driveshaft around to check the universal joints and make sure that they do not lock up or squeak, also apply the stethoscope to check the center bearing for any sound of wear. Grasp each joint with the hands and try to twist to ensure that there is relative motion which indicates that it is heavily worn out also ensure that mounting bolts and nuts are tight. Last but not the least, check the condition of the center bearing; whether it has come loose or the rubber has perished; see that the bracket holding the bearing is not bent.

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