History / OriginalityGot a question about 1982-1992 Camaro or Firebird history? Have a question about original parts, options, RPO codes, when something was available, or how to document your car? Those questions, answers, and much more!
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ok, so i have an 87 IROC, and i was looking up the RPO codes and i dunno what this G92 code is for, is it a rare option for a ttop iroc?? just curious.
well im not an expert but i believe it is the performance rear axle with a good ratio such as 323 342 345 373 or something along those lines. ther is an rpo decoder on this site and numerous others in the web so a little detective work could help a lil more.good luck
tjhank you, i will look at the RPO decoder sometime tonight. is there any insight as to whether it was rare or not?i dont really car cuz the car is getting twin turboes and has no AC and is all ripped apart lol, just curious.
well i cant really help you ther as im a firebird guy rather than camaro but most of the ones i see are peg legs with like a 273 or some highway gear not even sure production numbers like that are available good luck, twin turbo?
wow gonna be crazy make sure everything is up to the task thats alot of oomph!
I'd like an expert to answer this.....in 87 what did G92 mean?
I had an 87 Players IROC (AU4) it had the GM3 3.45s but no G92
RPO codes don't change from year to year that I know of. G80 is a limited slip differential for my 91 Camaro. For a 06 cadillac cts a G80 is still a limited slip differential. The G92 is for performace axle ratio but does not specify axle ratio. I could be wrong though.
yes, it will be a built 305 Twin turbo. i am a firebird guy myself, but the iroc has a much more aggresive look to it. i like my firebird for DD and pickin up ladies, but the iroc is to defeat street bikes.
RPO codes don't change from year to year that I know of. G80 is a limited slip differential for my 91 Camaro. For a 06 cadillac cts a G80 is still a limited slip differential. The G92 is for performace axle ratio but does not specify axle ratio. I could be wrong though.
but RPOS codes do change. WS6 did several times in the 80's.
I know what your saying but why didn't my 3.45 car say G92?
As DJP87Z28 stated G92 was mainly the performance axle ratio option but it's content was added to some years.My '83 Z28 has it and the ratio is 3.23 with the LU5/700R4.On your SPID your axle code should be a "G" code.Also you can look on the passenger side axle tube - diff side about midways.The full code was stamped intoo the tube including build date(hopefully it's still readable).Another way is to pull the cover as it could have been chaged over the years.
And GM has a habit of reusing RPO codes but then some don't change.G80 has been posi-trac option code since the early '60s at least.
__________________ '07 Avalanche LTZ 5.3 FFV/4L60E/3.73,K&N CAI,Magnaflow,Superchips Flaspaq
'83 Z/28 LU5 305 CFI/K&N/Factory Dual Electric Fans/MSD-Hypertech Coil/Performance Rebuilt 700R4/JG1/J65/G80/G92-3.23/Hollow 36mm front-24mm rear bar,TDS steering brace,16" single stripe IROC /T-tops/Pwr everything
'73 C-10 CST 454/TH400(Factory BB Truck)A/C,Tilt,12 Bolt Posi,Dynomax
Miss my '70 Monte Carlo SS454
ok, so i have an 87 IROC, and i was looking up the RPO codes and i dunno what this G92 code is for, is it a rare option for a ttop iroc?? just curious.
For your '87 Iroc, if you have RPO G92 on your SPID, that means you have . . .
- LB9 305 TPI engine.
- G80 limited slip rear diff.
- J65 rear disk brakes.
- KC4 engine oil cooler.
As far as the rear performance diff goes, if you have the 5sp std tranny you'd then get the 3.45 ratio Borg-Warner 9 bolt. If you had the auto tranny then you got the 3.23 ratio.
Not sure how rare it is regarding the t-top. Probably not very. Even the convertibles could have the G92. Out of the total '87 Iroc production of 38,889 (plus another 744 Z28 & Iroc verts), 10,533 had the G92 option. That's a lot of G92's. Roughly 1 in 4 had it.
I'd like an expert to answer this.....in 87 what did G92 mean?
See above.
Quote:
Originally Posted by 871LEIroc
I had an 87 Players IROC (AU4) it had the GM3 3.45s but no G92
There were no 1LE's made in 1987. They didn't even exist until the following year, 1988 (and only 4 existed). And it wasn't until 1989 that the first 1LE's were imported into Canada to enter the Players racing series.
The reason why I'm mentioning this is that the 1LE was automatically triggered by the RPO G92 package. Your 1987 ride is not a 1LE, so this may not guarantee that it would also have the G92.
However, because your ride was an A4U Players Series car (AU4 is driver's side power lock), it would still include performance options. And one of those options may have been the GM3 3.45 rear ratio.
While I can't prove this 100% without more information (like seeing the original SPID, etc), it's a possible explanation.
G92 was a performance rear axle. It included a few other things, but the 87 mentioned above without G92 is probably because the car was ordered specific for racing. G92 included the oil cooler, 4 wheel disc brakes, posi and the best gear ratio available for the engine option. Based on your description, you didn't say anything about posi. Do you have that? If you don't have all the options, you don't have G92.
