Originally Posted by Jerry Bransford
That vibe is indeed caused by a steepened rear driveshaft angle caused by the new suspension lift. You can cure the vibe by dropping the transfer case skidplate by a half-inch or so via longer skidplate mounting bolts & washers stacked up around each of the 6 bolts and inserted between the frame and skidplate.
If you are interested, I have the 6 grade 8 bolts with the bunches of grade 8 washers needed to lower the transfer case an inch. I paid $50 for this stuff and then the OME kit I purchased to lift my TJ came with the lowering kit. My King Bolt store won't take the bolts and washers back for unknown crappy reasons. I will give you a good deal.