What determines my rear? My RPO code says GU5 and G92 and G80, what do I have? So it says I have 3.23s, posi, and performance axle....but I'm pretty sure I have a 10 bolt....whats up with the G92 RPO if I have 3.23s, or did the G92 give the OPTION of a 9 bolt...

this website says the 9 bolt came only with 3.27, and that the g92 option was the 9 bolt, another site says the g92 was the 3.23 performance option, the RPO decoder says g80 is 3.23, why have 2 rpos for 1 axle ratio? im confused, im almost 100% sure i have a 10 bolt, and my rear isn't painted black, it's rusted over....

 

the best bet is to climb under the back of the car and count the cover bolts, 10 bolt or 9 will tell you what it is.

 

I'm just wondering about the RPO codes, Did G92 mean you MIGHT have the 9 bolt.....thirdgen.org says G92 means 9 bolt, and G80 means 3.23, but how can I have both, 3.23 wasn't an option with the 9 bolt....then another site says that the G92 was the 3.23 gear ratio....something is wrong...I'm almost 100% sure I have a 10 bolt....I did go under, but the rear of my car is so low and I didn't have a jack at the time, so I was counting one side of the cover, then moving over and counting the other side, I couldnt' see, so I was just feeling for bolts, I might have counted a bolt twice. If someone can clear the RPO code up for me it would make it alot easier.

My codes:
G92 : AXLE REAR RATIO, PERFORMANCE
G80 : AXLE POSITRACTION, LIMITED SLIP
GU5 : AXLE REAR, 3.23 RATIO

I have all 4 of the required options for the G92, so either the GU5 is incorrect, and should not be there (3.27 was BW, yet GU5 is 3.23) It would be nice if i had a 9 bolt, I need the extra strength

 

Screw the codes. Count the bolts. Park the car with the rear hangina over a curb so you can see it. If you want to know what the gears are, take off the cover and look. People change stuff about rear ends all the time; who knows whether whatever the "codes" say your car came with, is still there.

 

No you do not have a BW 9-bolt as your RPO code indicate it is a 10-bolt 3:23 with a Limited Slip & G92 is for the upgraded performance ratio (3:23). Now whats is so hard about that. Or you can get down and dirty and look at the rear for yourself.

Note! If your car is a later model then a 1989, 10-bolts were the only rear used on Factory 3rd Gen cars.

 

I want to know what codes are what though, is the G92 code really the 9 bolt code? If so I should have it, but if the GU5 code is 3.23 then something is wrong....does anyone have a 9 bolt and can help me out?

 

Stop and think for a minute. G92 only denotes a performance rear
which you have with the GU5 3:23 & G80 Limited Slip. It has nothing to do with a 9-Bolt. Since I take it your not the original owner, the first buyer opted for a upgraded rear. Again what year is your car????

 

87', the info on third gen.org makes it sound like G92 was the BW rear code

does www.9bolt.com sell COMPLETE 9 bolt rears? if so how much.....

 

I don't know if 9bolt.com sells complete rears or not.

However, I found an excellent site if FL that sells them (no connection to me), and no, they will not sell you the elusive 9 bolt ring and pinion... but they do have complete rears:

http://www.tacreationsusa.com/

I ordered my first item from them today so I can't really say too much about them, but they have been really helpful through the email.

(soon to have a 9 bolt in my 89RS)

 

My '89 had a 9 bolt and it did not have the G92 code. The codes it had for the rear are:
GW6: Axle rear 3.27 ratio
G80: Posi

The rest are performance engine packages and other codes.