Chevy Chevy II Muscle & Classic Car Differentials

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

I'm sorry to have to tell you this, but the '64 GTO was not the first muscle car.

Who gets your pick as the best manufacturer from the golden age of the muscle car wars?

Jim White's '62 Chevy II is a family car, but not in the way that you might expect.

Learn what gear oils do for your differential and how to choose the best gear lubricant for your application's needs

A brief overview of the steps Speedway Motors takes to ensure you get a quality differential.

Learn the benefits of independent front suspension, or IFS, and how it vastly improves your vehicle’s braking and handling

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!

Take a look at a few of the rare and wonderful Chevy engines in the Museum of American Speed!

Over several generations of small block Chevy (and big block Chevy) engines there have been several changes that dictate what flexplate works with them. We’ll help you determine the correct flexplate for your Chevy engine in this buyer’s guide.