Which Junkyard Vehicle for a Dana 60 Drag Car

I got a Dana 60 heavy duty from a Dodge 3/4 ton off of Craigslist for a hundred sixty bucks... It had 410 gears that were great and actually had brand new brakes and all that stuff that I sold for $40 along with the axels. I was$120 into my housing and gears.. I'm not sure what's wrong with the heavy duty I felt it was LOL heavy duty...