What I thought was the trans, ended up being the rear diff. First experience with this, but since I serviced it last year and have never beat on the truck, I immediately thought I lost the clutch pack(s). The original owner must have done a crap ton of towing with this thing and let it sit out. The drive gear was all rusty and the pinion gear completely shattered.
Anyway, 3.42 and posi are in the works.