Modified Differentials

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

Comparing open diff vs limited slip vs locker differentials. Learn how each works, pros and cons, and which is best for your build.

A short article explaining the main differences between open and limited slip differentials.

The pros and cons of a welded diff vs open diff, plus what to know before learning how to weld your differential.

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

Dirt modified racing delivers high-horsepower, adrenaline-fueled action, learn more about them and their racing classes

This article demonstrates how to install a complete Winters quick change kit with additional parts including birdcages, brackets, and calipers for a modified race car.

Devyn Peterson is an Auto Tech in the Speedway Motors Customer Experience center. He's also a racer, starting out in karts when he was just 5 years old. He moved up to a Modified when he was 13 and hasn't looked back!

How proportioning valves work, fixed vs adjustable valves explained, and how to reset a prop valve.

Read how to lower the rear of your 92-98 Chevy pickup using a DJM lowering kit. These tips are helpful for smooth completion.