Yeah ..he kinda threw me for a loop with his responce... had me 2nd guessing myself...I'd never heard of reverse rotation in gm.....here's his response by email.....I also just noticed he said it was 8.25 also...
If you ever talk to AC dont weigh to heavily on what he says.....
Subject
Im changing the gear ratio in my GM axles...they are from a 1991 suburban 3/4t...
Response By Email (AC) (01/16/2019 04:08 PM)
Greg,
The front would be an 8.25 or a 9.25" IFS. Either should be a reverse rotation gear set. The rear could be a 10.5" rear gear or a 9.5". Both would have a 10 bolt cover.
The following would help ID the units.
http://www.diffwizard.com/DiffWizard.aspx
We appreciate your business
AC
Summit Racing Equipment