I have a N/A regal and bought a open diff 8.5 for a fair price around a year ago. I haven't installed yet, but would rebuild with new posi, bearings etc. My question is, how much money do people have in there 8.5 rebuild? I'm thinking it might be cheaper to sell it and upgrade to a ford 9", giving the place I work I think I could get into one for around $1000-$1200, not including the price I sell the 8.5 for. Opinions? Thanks