The Novas had an 8.2" 10 bolt rear end in them from '62-'67. The standard gearing was 3.08:1 in coupes and sedans, and 3.36:1 in the station wagons. The differential from any other GM product with the 8.2" 10-bolt will interchange. From 1964 on, they had 5 lug axles which should interchange with the first 2 years of production, but I'm not positive about the interchangeability without doing a little more research.
