Did you pull both drive shafts and check the u-joints?
Mine where bad and did that.Grease them when you have them out,unless your grease gun fits in with them bolted on.
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under 5 mph, something seems to be binding.

90 Amigo,Front 10 bolt with powertrax locker,Rear Dana 44 with Detroit Locker at 5:38.1 R&Ps,Pro Comp MT's 33x12.5 on 15x8 black Rockcrawlers,with a 3" suspension lift.Pro Comp steering Stabilizer.Warn M8000 winch in a ARB bullbar.