GM Service Manual Online
For 1990-2009 cars only

Important: Do not replace missing balance weights or straighten a bent tube.

An unbalanced propeller shaft and universal joint assembly may be caused by one or more of the following conditions:

    â€¢ Missing balance weights
    â€¢ Bent, dented, or damaged tubing
    â€¢ Worn slip spline inboard type
    â€¢ Foreign material on the propeller shaft tubing or the end yokes
    â€¢ Improperly installed propeller shaft and universal joint assembly
    â€¢ If one or more of these conditions exist clean and inspect the propeller shaft assembly and replace as nessesary.