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

Testing a 2 or 3 wire speed sensor sounds difficult, but these videos show that it actually is quite easy!

Testing 2 and 3 Wire Speed Sensors

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

Looking to swap the venerable LS engine into your hot rod, muscle car, or classic truck? Take a look at our detailed identification guide for Gen III/IV LS engines before you hit the salvage yard or swap meet!

Gen III/IV LS Engine ID Guide

Check out this headlight wiring and taillight wiring diagram.

Headlight & Taillight Wiring Diagram

Electrical wiring is one of those tasks that enthusiasts dread tackling on their own. We're here to tell you that wiring your project vehicle is something you can do with a little help from your friends at Speedway Motors!

The Best Wiring Solution for Your Hot Rod or Muscle Car Project

Learn more about GM steering column identification, GM steering column lengths, and GM steering column compatibility.

GM Steering Column Compatibility, Interchange & Repair Guide

Why convert to an LED-style headlight or taillight system? Click here to find out how to do it the easy way!

Light Emitting Diodes (LED's)

Watch our Steering Column Wiring Guide video for useful tips on wiring your new steering column for your vehicle. Ididit takes you through the wiring process.

Steering Column Wiring Guide

Learn about GM alternator identification in our guide. We cover GM 3 wire alternators, 1 wire alternators, and externally regulated so you know what to choose.

GM Alternator Identification

Engine Family Facets

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3rd Gen GM F-Body AMC V8 Gen 2 290 Electrical, Lighting and Wiring Parts

3rd Gen GM F-Body AMC V8 Gen 2 290 Electrical, Lighting and Wiring Parts | Speedway Motors

Shop 3rd Gen GM F-Body AMC V8 Gen 2 290 Electrical, Lighting and Wiring Parts and get Free Shipping on orders over $199 at Speedway Motors.

Powermaster 7127 Retro Alternator, 85 Amps, V-belt, 12V, GM

3rd Gen GM F-Body AMC V8 Gen 2 290 Electrical, Lighting and Wiring Parts

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Powermaster 7127 Retro Alternator, 85 Amps, V-belt, 12V, GM

Powermaster 8005 Race Alternator, 80 Amps, V-belt, 12V, GM