Modified Ford 9 Inch Differentials

Learn why the Ford 9-inch rear end is the go-to axle for performance builds, and why this legendary rear end is trusted for high-horsepower applications

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

Need help with rear end identification for your muscle car or hot rod? Learn how to identify 9-inch Ford housings and how to measure your axles with our diagrams.

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

Lucas P. explains how to choose the correct part for a Ford 9" third member build in order to achieve a bulletproof rear. You will find specific recommended parts to use from Speedway Motors.

In this video, we go through the process of measuring and cutting 9" Ford axles.

In this Tech Tip, John responds to a customer looking to upgrade the 8” stock differential in his Cougar to a 9” open diff.

Learn how to assemble one of our bolt on nine-inch Ford disc brake kits in this step-by-step guide.

Advantages of using Speedway Motors weld-on rear disc brake kit for a Ford 9-Inch rear end. Learn some tips for installation. This kit includes IMCA approved brake calipers.