stiers

iTrader: (1)

I don't have my RPO codes anymore and I am trying to figure out what carier and series gears I have so I can upgrade my GTA from 3.23s to 3.73s. Anyone know where to look or have an answer?

five7kid

iTrader: (14)

Pull the cover, look for the stampings on the edge of the ring gear and end of the pinion gear.

If 3.23, that's 3-series. Assuming someone sometime in the past didn't change from 2.73's with 2-series 3.23 gears.

MdFormula350

87 IROC-Z
Formula
Trans Am
GTA A4 L98 V8 9.3:1 5.7 (350) 225@4400 330@2800 TPI ---- ---- 3.27* ----
*Borg-Warner rear axle


looks like u have a 9 bolt.

www.9bolt.com

stiers

iTrader: (1)

Is that a good thing or a bad thing?

MdFormula350

good i guess, its a real strong rear end.

stiers

iTrader: (1)

I looked at 9bolt.com and didn't really see much there as far as information or pricing for gears. How much am I going to have to spend to get a set of 3.73s for this rear end?

fisherbody86

A lot. I can't remember where, but I priced out gears for a 9 bolt and it's like $400 for a gearset instead of the $179 for a 10 bolt gearset. And 9 bolt's have weird gear ratio's so you might not see a 3.73 ratio per say, but something close like 3.70 or something.

stiers

iTrader: (1)

Thats not what I wanted to hear I guess she isn't going to be getting new gears anytime soon. $400 isn't worth the jump from 3.23 to 3.73

DoBeR

iTrader: (1)

Parts for 9 bolts are more expensive because they arent nearly as common as a 10 bolt. They are quite a bit stronger than the 10 bolt though. Theres a few companies that make gearsets for them and one company makes axles for them. If 3.45s would be good enough for you, than 5 spd cars with G92 came with those so you could find a used set for pretty cheap.