Where to find 3.90 ring & pinion

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May 20, 2008 | 10:19 PM

IROCUDREW

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From: Florida

Car: 1989 Chevorolet Iroc-z convertible

Engine: 383, holley terminator efi

Transmission: T-56

Axle/Gears: stock 10 bolt w/ 3.73

Where to find 3.90 ring & pinion

I have a 1989 Camaro with a 2.73 rear. This is a 2 series rear. I want to put a 3.90 rear in it.

Thanks

May 20, 2008 | 10:49 PM

AlkyIROC

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Joined: Jul 1999

Posts: 17,268

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From: 51°N 114°W, 3500'

Car: 87 IROC L98

Engine: 588 Alcohol BBC

Transmission: Powerglide

Axle/Gears: Ford 9"/31 spline spool/4.86

Re: Where to find 3.90 ring & pinion

It's not a common size for the tiny 7.5" ring and pinion. There are very few performance ratios available.

3.23
3.42
3.73
4.10
4.56 with a special cross pin.

May 21, 2008 | 09:23 PM

flyin89

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Re: Where to find 3.90 ring & pinion

It would be easier to shift your tire size around for the effect your looking for than bothering with 3:90's.

4:10 with a 28" tall tire run around the same RPM as a 3:73 with a 26" tall tire. Find your medium.