I forgot to mention, I have lock-out hubs, they were unlocked. I checked the trans fluid, transfer case (just a tad low), and the rear diff (also a tad low). I added fluid to the tranny and rear diff. The vibration seemed to be coming up through the floor, but it's hard to pinpoint those kind of things.

Thanks again,
Wink

98 T100 SR5 4WD
Rhino Liner
Warn Hubs
Mostly Stock