You will need to either spin the driveshaft and count the revolutions, or better yet, pull the cover and count teeth (if this is the stock rear end anyway).

 

That is your RPO list. In there, you have GU6 which is 3.42:1 gears, same as I'm running. So you definitely have a 3 series carrier.

 

You can run any gear you want. The reason we needed to know what carrier it had was because if you had 2.73's to 3.08's, it would have been a 2 series carrier and you would have had to get gears for that carrier. 3 series carriers are great and yes, you can put 4.10's in that car. You just need to know what one to order because there are 2 4.10's for the 7.5 rear end. Notice in the link below, in the specs, it states a Series as 3. This is the info you needed.

https://www.summitracing.com/parts/sum-741015/overview/

 

You have a 7.5" rear, not .65. But yes, you will be fine. Get someone that has done a LOT of these gears to install it for you. Otherwise they will whine their ass off and destroy themselves.

 

My pleasure.

 

Only the V6's had the 3.08. And as far as I know, they were all open diff.