I have 91 Z/28 with 3.23s and I want to know what the right GM part number for 3.73 gears? Also will it improve my performace?

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91 Camaro Z/28 5.7
SLP catback
SLP runners
SLP 1 5/8" headers
TPIS airfoil
Thermomaster chip/160 degree thermostat
gutted airboxes/K&N filters

You can get GM gears from all sorts of places besides GM. Here's a couple

www.racenet.net
www.drivetraindirect.com

there are plenty more

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