If a drive shaft is out of balance, the body of the truck or the seat will vibrate. If you are not feeling any vibration and the welding was performed correctly, I wouldn’t be concerned.

Driveshaft balance consists of a number of separate components. First, in order for the shaft to be stable when spinning, the CV joints or U-joints must have no play in them.

In the tenth installment of Project Over/Under, we rebuild and balance the factory driveshaft with the help of Inland Empire Driveline Service in Corona, CA.

We show you how to measure for the correct-length driveshaft (and more) for your engine with help from the guys at Denny's Driveshafts.