Vibration at highway speeds....did I put my driveshaft back up wrong?

[rockola1971]

It's honestly hard to tell for sure but if I had to guess I would say it seems more like the rear.

If your driveshafts are original to the 2003 vehicle AND the Original ujoints are still installed then your Ujoints need replaced! No doubt about it. The easiest way to tell if the Ujoints have been replaced is look at see if there are C-clips holding the Ujoint cups in place. If not then the original injection molded plastic is holding the originals in. You may have gotten a little crazy on the lift and made the driveshaft angle too steep also which will really put stress on a already well worn Ujoint if its original. What kinda angle are your driveshafts at? The problem could be of course in the tires/rim and maybe even the rearend. Doing all this stuff at the same time is going to make it hard to figure out.

This is definitely one that a person in the know would have to drive your vehicle and even sit in different places of the vehicle while someone else is driving to figure out which direction to go looking.

Might try throwing the original tires and rims on it and see if the vibration goes away.

 

[Rocket Man]

You should definitely replace the u-joint clamps with new if you didn’t mark them. They conform to the exact shape of the u-joints when first installed and should never be put in different locations.I failed to do that once and had one break. I got lucky and wasn’t going too fast (although WOT with a blower and cam) so the end of the dangling driveline only took a corner off my oil pan. If I was going faster it would have been a disaster. They could also cause vibration before they let go.