U-joint replaced.......vibration

[spacoli]

I had a vibration only around 25 mph and when I had a load in the truck, I had no vibration. So I thought it had to be the older u-joint (replace one already two years ago).

I had the truck in for inspection and had the shop change the u-joint. It fixed the vibration at 25 mph, but now I have the faint vibration at higher speeds that I didn't have before. The vibration is typical rythmic sound that you hear when a u-joint is going bad.

Any thoughts or ideas what might be causing this? Bad u-joint, bad instalation? Thanks

[stump runner]

take it back. if they did it wrong, they should warrantee it. it is possible that the vibrations from the bad one damaged the good one. also could be a worn or over extended slip joint. take a look and verify that the u-joint yokes are "in phase" with each other. ie: if the slip joints were disassembled and put back together incorrectly. i don't know how to explain it any better than that.

[spacoli]

I was thinking maybe it was put back together how the shaft was originally ballanced. I seen a white mark on the yoke, but I didn't look for a mark on the shaft. I will look tonight after work. thanks

[spacoli]

Yep, there was a white mark on the shaft and it was not lined up with the yoke, I will have to un-bolt and line up.