Here's what is going on. When in 4h or 4L there is a terrible grinding noise coming from my front axle. It started soon after I put my yukons and detroit in. I have eliminated it being the driveshaft, t-case or the lockouts. The noise seems to come from the differential. I pulled the cover today and the ring and pinion look perfect. There were no shavings in the oil and the carrier bearings looked ok. All the ring gear bolts were tight and the caps were tight as well. The only thing that I can think it may be is the carrier bearings. When I put the detroit on, I though we might have damaged one of the bearings during the removal process. The thing that keeps throwing me is that the noise occurs with each revolution of the tire with no variance. This makes me think that something is rubbing somewhere. I checked the axleshafts and u-joints to make sure they were not grinding against anything. I disassembled the wheels down to the spindle and made sure the wheel bearings and spindle bearings were fine. I cant figure this out and it's driving me crazy. The noise is much less apparent when under load. It's definately louder when just coasting. I dunno. Suggestions please.