Hey I have a question is there any way to know what my gear ratio with out opening the rear end? I have a 95 z28 and was wanting bigger gear but am not sure what i have. Any info will help. Thanks

 

Look at the sticker in the glove box. Look for one of these RPO codes.

GU2 - 2.73
GU4 - 3.08
GU5 - 3.23
GU6 - 3.42
GW6 - 3.27
GM3 - 3.45
GT4 - 3.73
G80 - posi
G92 - performance

If someone says the only forsure way to know is to open the axle and look, they're right. But how many cars honestly have had their axles changed, without the owner knowing about it?

 

cool yeah you are right i might wanna open the axel but i will check the glove box out first to see what i can find. Thanks i appreciate it.

 

Once you get the ratio from the RPO code you can also doublecheck the MPH against the RPM's at a site like www.f-body.org/gears/