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12 Bolt GM Car, 8.875” Pro Gears
Category: Ring & Pinion Sets
Part Number(s): GM 12 Bolt Car, 8.875”, 9310, 4 Series
Fits 4 series carrier (original ratios of 3.73 and numerically higher) with 1.325” distance from bearing shoulder to ring gear flange. 8.875” ring gear diameter, 1.625" dia. pinion stem, 30 spline pinion. Manufactured from 9310 alloy. These gears are used for ultra high horsepower drag racing applications.
Special pin (P/N 80-0269) required for ratios 5.57 and numerically higher.
$326.35 - $420.53

Items marked with an asterisk (*) are available with limited stock
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12 Bolt GM Passenger Car Installation Kit
Part Number(s):  83-1019
Installation kit contains all the parts required for a complete ring and pinion installation, including pinion and carrier shims, pinion seal, crush sleeve or preload shims, ring gear bolts, pinion nut and washer, and cover gasket along with gear marking
Price: $161.21
Shot Peen Gear Upgrade
Part Number(s):  PEEN-02
Add Shot-Peening to your Ring and Pinion Gear.

This surface improvement decreases the likelihood of cracks forming on the gear.
Nearly all fatigue cracks begin at the surface of the part. By overlapping the dimples of the media, Shot-Pee
Price: $95.00
Special GM 12 Bolt Cross Pin
Part Number(s):  80-0269
12 Bolt Posi (for 5.14 to 6.14 ratios with stock c-clip axles)
Price: $39.38