U-joints are used to absorb vibrations and shock in the drive line, they are also used to allow the rear/front to travel up and down, If you sense one is going bad the easiest diagnosis is that it will begin to pop loudly when you put it in gear, reverse or drive, I hope this helps you
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Ball joints are in the front suspension, it is basically what the wheel assembly pivots on when you turn. Universal joints are on the ends of the drive shaft in a rear wheel drive vehicle. At the transmission and rear end. They give the drive line some flexibility. The same principal is in front wheel drive but are referred to as constant velocity joints, or CV joints.
Correctly phasing the u joints will prevent driveling vibration Doing it incorrectly can cause a damaging vibration that can ruin, transmission, transfer case, differential etc.
Universal/U-joints are used to transfer power/torque from and engine to the drive-shafts and rear differentials. The U-joints allow the driveshaft and suspension to move thru it's normal range of motion, while still being able to transfer the power from the engine/transmission.
to keep the two joints from coming apart ---------------------- 2nd answerer says: To apply pressure so that the glue is pushed into the pores of the wood for a better bond.
the most likely cause would be an improperly tensioned serpentine belt