Vibration after 6’ Lift kit install

[bredlich]

Ok, I installed a 6 inch pro comp lift kit about 3 months ago on my 2001 F350 crew cab longed and have been having an annoying vibration only when I take off up to about 8 miles an hour. I figured it was axle wrap so I bought the pro comp ladder bars thinking it would solve the problem…no luck! It does not vibrate at any speed above 8 miles an hour so I figured it has to axle wrap. I figured I would try to adjust the drive line angle just to see if it would help so I bought the kit. In the instructions it specifically said that it would not stop vibrations at take off, only at driving speeds….so I returned it to save money.
Has anyone had this problem and if so what would fix it? what is causing it? It is a really bad if I tow a trailer.
Please help

[cchase]

bad ujoints or carrier bearing?

[fordmugg]

no you needed that kit ....the pro comp carrier bearing kit ....i have the same one at it said the same thing but it will take it away you just have to spend some time with the diffrent size spacers to get it right

[bredlich]

U- joints are fine i thought the same thing. Ok, i will get that kit and try it. Fordmugg, did you only have the vibration at take off also?
Thanks

[EVIL OVAL]

Yeah you need the carrier bearing shim kit, i put the Pro Comp 6 inch on and had driveline vibration...The shim will take care of it!

[bigcountrysg]

I would try carrier bearing shims like already mentioned.

[fordmugg]

Originally Posted by bredlich

U- joints are fine i thought the same thing. Ok, i will get that kit and try it. Fordmugg, did you only have the vibration at take off also?
Thanks

yep around 10 to 15 mph and then it would go away and be fine ....but once i did the shims it was all good

[gtspowerstroke]

Yeah it's the carrier bearing that needs to be shimmed. Just to clarify it is NOT the tapered pinion angle shims that you need that go under the leaf springs but the shims that space the carrier bearing in the center of your drive line down. I want to say the general rule of thumb is 1/4" of shim for ever 1" of lift. On my 4" lift I have two 3/8" plates to space the bearing down and that was enough to make the vibration go away.