APACHE JOHN

Car is a 85 Iroc w/TPI. The SPID show G92, GU6 but no G80.......did all G92 cars get posi-trac? Thanks in advance. It also has 4 wheel disc brakes.

mr396

Can you post your a picture of your spid? What month was your car made?

yaj15

iTrader: (3)

No not all of the LB9 TPI cars got positraction from the factory.

Not all of the L69 305 H.O. motors got positraction either.

Positraction was manditory with the L98's though.

It's just kind of strange because the L69, LB9, L98 engines were the high performance engines from the factory so you think that they all should have had the performance related drivetrain options to support that.

I'm sure it has to do with economics. I'm sure GM was able to produce non-positraction rear ends at a lower cost than positraction rears.

yo soy el warg

Does your car have B4Z,Z28 and 1C5? If it does have 1C5 then you have a California Iroc. None of them had G80, but did have everything else you said yours has.

Post a picture of your RPOs or list the Vin# and all the RPOs if you want to check it.

Here is a California IROC to compare your RPOs to.

https://www.thirdgen.org/forums/hist...-code-z5v.html

APACHE JOHN

Not a California car, Blue, true Iroc. I'll take the cover off, when I remove it (parts car) wish they could have put G80 on the SPID or someone knew if G80 was mandatory with G92. I'll try to find the VIN tonight, car is at my storage location.

yaj15

iTrader: (3)

I don't think that the G92 option automatically selected G80 positraction for the LB9 cars all the time. A lot of LB9/700r4 cars didn't come with positraction even if they had the G92 option though.

For the 1985 LB9 IROC the 3.42 gears were the G92 option and I think 3.23 gears were the non-G92 axle ratio option. G80 positraction wasn't manditory though with the LB9

I don't think that the regular Z28 LB9 cars got 3.42 gears, I think that was just reserved for the IROC's. Many 1985 LB9 Z28's got 3.23, 3.08 gears, and 2.73 gears. Not all of them had positraction.


Check out these links below. They have transmission and rear axle gear information

https://www.thirdgen.org/calculations

https://www.thirdgen.org/1985-chevy-camaro

I know that with the '89-'92 cars that the G92 option (LB9 & L98) included some other performance options and a positraction rear end was manditory just like with all the L98 cars posi was manditory.

DJP87Z28

RPO G92 and G80 were extra cost options and were not required unless you ordered them .

yo soy el warg

here is more on the G92 and G80 options.

https://www.thirdgen.org/forums/hist...2-mystery.html