Freeride: center bearing and support was replaced when driveshaft was re-built and balanced 6 months ago.Driveshaft balanced with new bearing and carrier
dpkreuze:
location:hard to say, I feel it through the seat and the floor.
frequency:It seems to be the same frequency as the driveshaft-rearend,as I said before the vibration "only" appears in 4th gear.No matter what the engine rpm.
sounds:no sounds associated with the vibration.
driveshaft:no, I tried shimming the center bearing on the driveshaft no difference.

thanks.