I believe I have a G92 Axle (9 bolt Aussie Posi) but it is not in my RPO codes. Is this normal?

 

I'm pretty sure that as far as axle is concerned, G92 only meant that you'd get a 3.42(3.45 BW) ratio, not whether or not it was a 9 or a 10 bolt.

To my knowledge, no RPO on any thirdgen determined whether or not your car had a 9 bolt axle. I've never found an RPO for my 2.77 9 bolt.


G92 would also give you a dual cat set-up. Do you have a dual cat?

The axle obviously has either 9 or 10 bolts. The 9 has a tag with the ratio, and I beleive the 10 bolt has an axle code(which will tell you the ratio).

 

yes I have dual cats.
Car is:
1989 firebird formula
9 bolt Posi 3.45
dual cats
WS6
t-top
power everything
cloth interior
black/silver paint
grey interior
TPI 5.0(gone now 6.2)
5 speed WC T5

 

OK, I misread.

You're issue isn't the axle, but rather the RPO

hehe...yeah, I don't know how they decided on who got 9 bolts. I know a lot more Birds got 'em early on. My 89 Iroc has one.

Anyone know?

 

I think in 89 the only cars to get G92 are 3.27 ratio seems this way with the tech data, but I still would like to know what it means.

 

I think I found a new peice to the puzzle, but confuses me even more as I have all the parts for the G92 but not the code.
Quote from http://www.camarosource.ca/php/camar....php?year=1991
Chevrolet built 478 Z28 Coupes with "1LE" equipment for 1991. As in 1989 and 1990, RPO G92 triggered the build. RPO G92 required one of two engine combinations, the 305ci LB9 V8 with 5-speed manual, or the 350ci B2L V8 with automatic transmission. When ordered with air condition_ing, RPO G92 ($466) included engine oil cooler, 4-wheel disc brakes (except for a brief period when 4-wheel discs were deleted with a $287 credit), and dual-converter exhaust. When ordered without air condi_tioning, RPO G92 ($675) added heavy-duty front brakes, aluminum driveshaft and spare wheel, special shocks and fuel pickup, and gas tank baffle. Fog lamps were deleted for weight savings and improved cooling.

 

PLus I have parts from the other non air equiped G92 like the aluminum spare wheel. Damn GM and their infernal RPO coding. Half the RPO codes that are packages could be put on your car with out having the actual package RPO Code.