if the vibes are from the rear make sure that the rear diff is at the exact same angle as the rear driveshaft. it they are from the front, get an aftermarket stering shock. You might also want to look into getting a motor mount lift and body lift instead if the tcase drop. It looks better, works better, and doesnt kill your ground clearance.
04' Columbia TJ
33" BFG AT's, OME HD lift, front airbag suspension, teralow 4:1 kit & supershort shaft kit, TW CV shaft, 4.10 gears, JKS body lift, track bars and quicker disconects, Warn 9.5ti, warn front bumper, garvin wilderness rack, and solid cast aluminum tusks,