I have a 1985 iroc, with the LB9 in it. Well, when I was looking at my codes and found one which is Gu6, they say that is the 3:42 gear. But in 1985 they say that is the performance option and you have to have G92 to get it, but I don't so what does that mean, does it mean I have the 3:42 or the standard 3:23. Also I have found that I have a code Z06 , I cant find anything about that one , what does that mean.

THANK YOU
MIKE

Yeah, you should both rpo G92, and GU6. Gu5 is 3.23 the standard rear end.

Ya I have only the gu6 code, there is no G92 to be seen, the only reason I can think of it to be like that is because I have the code 1AZ witch is a customer ordered the car special. and what about the codes Z06 ,b2g, e7z, gc5, gc6, ys3, and z21
those codes are the only ones I cant find.

THANKS FOR THE HELP
MIKE

I hope you guys will beable to help me more.

ZO6- ???
B2G - COMPONENTS OF IROC-Z PACKAGE
E7Z - SENSOR, VEHICLE SPEED - DELETE
GC5 is probably 6C5 - LAMP, INTERIOR ROOF, COURTESY AND READING
GC6 is probably 6C6 - SWITCH, REAR DOOR JAMB, LH & RH
YS3 - ???
Z21 - ???

Ok , thank you now i just have to find out what is up with the rear end code and the Zo6 code.

THANKS

Are you sure you are reading those right?

Z21 is the GT package for a Beretta and Z06 is a performance package for the Corvette.

Ya sorry for the z21, I meant to put 721 instead. Also what about the rear end code, by what my sheet says it is a 3:42 RPO gu6, but I thought u had to have the G92 code to get it because the standard rear is a 3:23, so what does that mean sense I don't have the G92 code.

Thanks
MIKE