check your u-joints also mine would vibe when i let off the gas replaced em and havnt had a problem

 

i just looked at rough country lift kits they do not give you the tc drop brackets with their 3inch lift kit it is offered with the 4,5 kits its worth a try

 

no 3 inch lift kit come with a tc drop kit you might be pushing the drive shaft in to far causing vibes

 

I'm confused. With a lift I would think that the rear axle is now lower thus further away from the x-fer case. So the driveshaft would be pulling away from the transfercase, right? The transfercase has been dropped an inch in the photos and should help mitigate any vibes since day one. Hopefully it is not causing additional damage to the transfer case when it is making those awful noises.

 

see hoe far the rubber is sticking out of the case in this pis look at yours you have pushed it way in this could cause the slider to be hitting the end of the shaft at tc case no 3inch kit recomends them only when you get to 4,5 i checked all kit at quadratec it worth a try

 

did the kit come with it

 

Think that we are over looking something here. Just to make sure the position of the yoke for those of us still having OEM driveshafts measure from the back of the transfer case to the center of the yoke. Mine measured 8" out from the back of the transfercase. Think this way we can actually start troubleshooting the issue.

 

i ran 7.5 inches of lift withtc drop ineed it if the drive shaft is pushed in further than it was at stock lift you could be hitting the in side of the slider on driveshaft on end of tc shaft did the kit you instslled come with it

 

Ya know, i just remembered i had this problem when i was at about 4" and it turned out that the yoke on the driveshaft would bind with the shaft on only 1 axis?! Pretty stupid if you ask me as you get about 45 degrees or movement on one axis and only like 25 degrees on the other. I clearanced the driveshaft with a die grinder and totally took care of the problem. Say what you will about this mod but i've had no ill effects but wouldn't recommend it for novice penny pincher as you can easily destroy your shaft if you're not carefull!

 

these are bad angles but note how far the drive shaft is out in bottom pic

 

Kit did not come with it. Guys over at 4 wheel parts tell me that it is pretty much always required with the lift I got. Some time you get lucky however. This one is not lucky. If you were running at 7.5" out then mine is out half an inch further. Not exactly sure how much engagement or overlap is available in the transfer case, but suspect it is out further than need be.

 

Talking with RE they said this is possible. If you see metal on metal wear and tear then you can relive that area with a dremel. I have been under there pretty much every evening looking for signs of metal on metal rubbing. Only thing I did notice is that I can rotate the drive shaft with my hand back and forth with an audible knock each side. U joints look OK.

 

ok hope you fix it