I've seen post that say that there is not a big difference between the 2. But there is huge diff from my 2.** what ever. The 3.23 keep a better gas on the road?

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87 Z28 305 TPI, Auto, Gutted air boxes, K & N fillters, Dyno Max 3" cat back, Accel 8.8 mm spirals, Accel cap and rotor, Accel coil, rapid fires, and 160 Stat.

 

either would work. if you have OD trans your milage shouldn't be hurt too much. i go with what ever i could find first (unless you're buying new gears). i think i'd go with the lower gears if it were me.

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-=ICON MOTORSPORTS=-

 

Go to one of those gear ratio/mph calculator sites and see what rpm your car will be turning at different mph in each of the gears and get the ratio that will best suit your driving. A 3.42 or a 3.23 will be a big increase over the 2.73 gears you have now. The 3.23 will be better if you do a lot of open highway traveling such as on the interstate but the 3.42 gears will be better for around town, drag strips ect. I have 3.42 gears but that's b/c I have a 5-speed with a 0.63 5th gear ratio and you have a 0.70 OD gear ratio so naturally you will turn higher rpms than I do with the 3.42 gears. If I was you while your doing the swap have a posi traction unit installed at the same time and it will help your traction out a lot but be careful in the rain! Your 91 should have the 28 spline axles so you can buy one of the Zexel Torsion take off units from SLP for $99 and it will bolt right in! We bought one and it looks to be in excellent condition, almost looks like they took it out of the 4th gen f-body before it was sold to the dealer. They are strong units and brand new they are $399. The Auburn posi-units are $320.

Another thing to watch out for is your rear-end housing normally won't accept anything over a 3.08 gear but Richmond makes gears now they specifically say they are for the 3.08 and lower rear-end housings that are 3.08 and higher in number. In other words if you got the 3.23 or 3.42 gears from another stock GM rear-end they will NOT work in your housing.

I bought a rear-end with a 3.42 gear in it already and then put the Auburn posi-unit in b/c at the time Richmond wasn't making the 3.42 gears for the lower rear-end housings.



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1988 TA 300+hp 350 w/ TBI and Holley TB unit, Holley projection intake,
WC T-5, 3.42 gears w/ Auburn posi. MSD 6A, edelbrock TES headers, dynomax 3" cat and cat-back system, ACCEL coil, polyurethane bushings all around, aluminum driveshaft, Mr. Gasket open air cleaner.

1993 S-10 w/ 4.3L V6 TBI, slightly bigger cam, Mild polish job and 3 angle valve job on heads, Edlebrock TES headers, Dynomax cat back, MSD 6A, ADS chip

2000 Kawasaki KX 125