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

In this budget build, a GM rear end is upgraded in order to hold 400+ HP. See how spherical bushings are replaced in a used 8.5” GM 10 bolt rear end.

Replacing GM Rear End Spherical Bushings

Here's our attempt to do the impossible: pick a favorite GM truck design!

Pick a Side: What Was the Best Generation of GM Trucks?

Engine Family Facets

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First Gen Mustang Buick 231 Parts

First Gen Mustang Buick 231 Parts | Speedway Motors

Shop First Gen Mustang Buick 231 Parts and get Free Shipping on orders over $175 at Speedway Motors.

Mr Gasket Magnetic 15 1/2"-20 Oil Pan Plug

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Thread Type

Thread Pitch

MFG. Part #

Gasket(s) Included

Thread Length

GTIN Code

1/2"-20 Thread Pitch, Gasket(s) Included

ACCEL 150630 Fuel Injectors, 30 lb/hr, High Impedance, 6 Pack

Driver Type

Wiring Harness Included

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Seat to Seat Height

Manifold O-Ring Outside Diameter

Fuel Rail O-Ring Outside Diameter

Outside Diameter

O-Rings Included

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Injector Impedance - Ohms

Injector Plug Style

Universal Fit, 2.88" Overall Height, O-Rings Included

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First Gen Mustang Buick 231 Parts

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Mr Gasket Magnetic 15 1/2"-20 Oil Pan Plug

ACCEL 150630 Fuel Injectors, 30 lb/hr, High Impedance, 6 Pack