I just changed out anll my univesal joints on my 2002 ford f150 4x4 and took out a 3" block lift in my rear end and now I have a vibration it the truck when coming to a stop. It is not the breaks because it does it when the breaks are not even pressed. I tried turning my drive shaft 180 degrees thinking I might have put it in wrong and it is still doing the same thing. Any ideas?

 

I have not messed with the Ujoint on one of these but, is it possible that you did not install on cap all the way or have one off center?

 

That is what I was going to check next. Thanks