Modified 31 Differential Spools

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

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

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

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

How to replace sway bars in a Mercury Comet and the advantages that come with it.

Tim M. has tried to stay true to the vintage route, but sometimes, exceptions must be made. For example, the original oiling system's paper element and canister are functional, but an upgraded system will be more reliable.

In this Tech Tip, John answers a customer question about finding the right axle length for his 1931 Model A.

Speedway Motors employee Tim M. decided to take us along as he takes another step in restoring a '32 Ford. This go-round he repairs an original '32 grille insert to put in his new shell.

Keep your rear cylinders running cool in a high performance engine by installing a water bypass kit to the intake manifold.

Click to learn about split wishbone, hairpin radius rod, and four bar suspensions. Learn the history and difference between these solid axle suspension designs.