I have 1987 IROC with a 305 tpi auto and G92 perf axle and G80 limited slip. What axle ratio do i have??

 

It's either 3.42 or 3.45 depending on the year - I'm not sure what 87 would be.

 

I didnt know they put G92 on 305 automatics in 87. Are you sure? If you have your RPO sheet in the glove box, write down all the codes that start with G, and then put them into the RPO decoder on here in the tech section.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

You are right,its rpo GU2 which is 2:73.WHY was it listed as a performance axle on my invoice.

 

You are right,its rpo GU2 which is 2:73.WHY was it listed as a performance axle on my invoice?