I have an 04 super crew that I just put some 22's on and the belltech shackels for the rear to level it out.

There is a slight shimmy to it now when you take off and a little virbration when your going.... Is something wrong? What do I do to fix it?

 

I used the McGaughy's drop kit and am experiencing a similar problem. With the S-Crew, the pinion angle becomes slightly off when the truck is lowered. I guess it has something to do with the longer driveline. McGaughy's suggests to remove a factory spacer that is located between the frame and the driveline. This should help some. The next step is to remove the actual bracket (requires cutting it off) and moving the driveline up closer to the frame. Hope this is helpful.