2 wd or 4x4? How stripped it the D50? What are your intentions with the truck when your done?
If you intend on drags trip or heavy street action with a 2wd, the 833 is the only smart choice, and its going to take some fabrication to get it there.
The stock D50 rear axle probably won't take the abuse either.

A 4x4 is going limit your choices a lot. Gene