Decode, ID, and upgrade your GM 12-bolt rear end. Learn axle specs, gear ratios, and best performance parts upgrades.

GM 12-Bolt Rear End Identification & Upgrade Guide

GM’s 10-bolt rear axle has been around since the 1960s, here’s how to determine if your junkyard find is worth taking home

GM 10-Bolt Identification and Upgrades | 7.625, 7.5, 8.2, 8.5, 8.6

Estimate horsepower, trap speed, and ET with our drag performance calculator. Use it as a 1/4 mile time estimator or 1/8 mile ET to mph calculator.

Drag Racing Calculator | 1/4 Mile & 1/8 Mile ET, MPH, and Horsepower

Engine Family Facets

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Pontiac Parisienne GM 8.875 Inch 12-Bolt Car Muscle & Classic Car Gauges and Instrumentation Parts

Pontiac Parisienne GM 8.875 Inch 12-Bolt Car Muscle & Classic Car Gauges and Instrumentation Parts | Speedway Motors

Shop Pontiac Parisienne GM 8.875 Inch 12-Bolt Car Muscle & Classic Car Gauges and Instrumentation Parts and get Free Shipping on orders over $175 at Speedway Motors.

40 Amp Adjustable Fan Switch and Relay Kit

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40 Amp Adjustable Fan Switch and Relay Kit