rear axle upgrade

Im trying to figure out if my truck has a 7.5 rear end its a 94 gmc sierra 4.3 v6 im going to start swaping an ls1 and wanted to swap the rear end to a 8.5 and add some gears to it ( if mines a 7.5

Hello hotrodders.com-ers I'm RETRO.FRESH and I just picked up a '62 falcon deluxe and was hoping to find some answers. First off, I'd like to swap out engine and tranny. Opinions welcome. Second, I'm a hound for the the best prices. If it's out there then I need it at my price. Third, where...

Hi - i know firebird rear ends swap right in - but nova's seem to have sketchy data on years 75.. I have an 8.5 rear 2.73 - im looking at an axle from a 75 nova - some say they are 7.5 OR 8.5, some say only 8.5.. depending on engine size - is this true? Is there a chance of finding a 7.5 on a...