[Hummie2]

Tim...

It could also be possible that its not a steering problem. It could be driveline related. How are the rubber bushings that mount the front axle assy. to the frame/crossmembers? I believe you said before that you first noticed it when you came back from Moab, is it possible one of the axle rubber isolaters could have been damaged? Also check your control arms on the rear axle. I recently changed my rear ride height slightly and could feel a vibration in the front floor and steering wheel. I had to install a CV rear driveshaft to cure the vibration. Those driveline angles are only correct when the "D" height is within spec. If it is driveline related the vibration will kill a set of pinion bearings in a short time.
Bad bushings in the rear control arms will not only alter the driveline angles, but will make the truck road wander especially on accel/decell.