i know this sounds dumb, .....but....i bought a iroc, and it is in the process of getting shipped here......how can i tell if it has a 9 or 10 bolt rear? i have the rpo codes he sent me in an email.....or does it even say on there???

i know its a posi, and i know the gears, but thats it

thanks

 

9 bolt has 9 bolts on the cover. 10 bolt has 10 bolts.

google for RPO codes. There are a lot of web sites that provide lists of RPO codes.

 

no *hit sherlock

i dont have the car here yet, so i cant just look under it and "count bolts"......i just wandered if there was a rpo code that identifies the rear end, ie 9 v/s 10 bolt rear

thanks for your help

 

No RPO code will say if it's a 9 or 10 bolt but there is a code telling you what gear ratio is in the diff. The 9 bolt only has 3 ratios offered from the factory and none of the 9 bolt ratios are the same as a 10 bolt.

If you have an RPO code for 2.77, 3.45 or 3.27 then there's a good chance it's a 9 bolt. Any other ratio and it's a 10 bolt.

Why didn't you just do the simplest method and ask the seller to look under the car before you bought it?

 

i should have asked before i bought it...i know....

but...according to the build sheet, it has GH3 277 ratio axle, and G80 positive traction, so what your saying is if it has the 2.77 then its a 9 bolt right?...

sorry bout being such a nooooooob

 

2.77 would indicate a 9 bolt with a 2 series carrier. If you manage to find 3.27 or 3.45 gears, you will need a 3 series carrier. Good luck finding any replacement gears unless you know someone in Australia.