[Junkit54]

I was wondering if 78 Caprices had the 7.5 or 8.5 inch 10bolt rear?

 

[homebudy]

They came with both 7.5 and 8.5 diffs. the 8.5 usually has a more oval cover (side to side) with notches out of it on either side where the axle tubes meet up with the diff housing