1966 Nova/Chevy II 12 Bolt 3.73 Posi Rearend

[big gear head]

It's not going to be a bolt in. The spring perches are not in the same location and you will have to cut them off and weld them back on. I recommend that you sell it and buy an aftermarket 12 bolt already set up the way you want it. Ordering a custom width doesn't cost any extra. The after market housings are much stronger than the factory housings, and you can get them with the press on 9 inch Ford axle bearings, which will eliminate the C clips. It's a much better rear end. I was a Moser Engineering dealer for 15 years and I sold a lot of these.