If you got a 2 piece drive shaft, make sure the entire shaft is straight all the way down if there's any angle that's where your vibration is comin from. Add some spacers to the carrier to drop it

 

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Did you install it yourself or did you pay someone to put the lift kit?

 

I had a family friend put it on for me. He restores old classic muscle cars all the time so he knows what he's doing, he not you stereotypical front yard mechanic.

 

That's great. But has he installed lifts on trucks before?

 

Thanks man! I'm airly confident that what ever is causing the vibration has something to do with the drive shaft so I'm hoping the pdf"s you added will help me figure it out. Gonna look over them this weekend and see if I can get it solved

 

Not a truck as new as mine. He's worked on older trucks though

 

Tell your mechanic friend to check again the rear block if in right position. Because your problem I've been that before I have my 3" rear block motofab no bump stop and it was installed INCORRECTLY. And rough country rear block has no Bump Stop. I'm 100% your rear block installed in opposite way. Let us know when you get it done and if you could take a picture of your rear block before switching it. And there is an arrow pointing, because that arrow need to be facing forward to installed correctly.