If you have a 2 piece drive shaft, more than likely, that is the problem.... you've changed the angle of it with the suspension lift which causes the vibration on take off.

I've learned to live with it for time being.... a lot of people go to a one piece drive shaft.... IIRC, your carrier bearing will wear out faster also.

If you have a 2 piece drive shaft, you MIGHT be able to do as what is describe in paragraph 3 of this article.....
http://www.customtacos.com/tech/index.php?article=27

HTH
Van <img src="/forums/images/graemlins/patriot.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" />