I found out what was making the squeeking noise. 
Good thing I carry a spare. 
The front pinnion bearing locked up and we had to change the 3rd on the trail.
It it entirely possible that I simply don't know the complete part breakdown on a 3rd member, but when you say, "front pinion bearing," I would expect to see you working on the front end of the rig? My only other guess is that there is two bearings on the pinion?
