I haven’t been here in a while or at least haven’t posted in a while but after signing in all I saw was ads stacked up one after another, after a minute or two it cleared up but it was strange.
The 8.25 can take some abuse but it’s not an axle that I would spend money on. You can find a 83/4 from an earlier pickup, 60s to 72. After that I would use the 9.25 you can find a LS in a 2wd pickup with disk brakes. One thing you don’t say is the bolt pattern that you want 5 on 4.5 or 5 on 5.5…
The only thing I can think of is its better to snap an axle than the differential, it is a 6000 lbs vehicle. The threaded nut is very small and it might have been a just very random fail. I don't know just glad it's fixed and damage was contained to axle, 4x4 hub and wheel hub.
One thing...