If you're looking to re-gear your differential, the USA Standard Gear Ring Gear & Installation Kit is a solid choice. This kit makes the whole process straightforward with just one part number. It comes with a complete ring and pinion set, plus a Master Installation Kit that has all the bearings, seals, and little bits you need for a proper install. I've used these kits myself, and I can tell you, they really take the guesswork out of the equation.

The quality is top-notch, too. USA Standard Gear puts their products through some serious in-house testing to make sure everything meets the right standards for dimensions, materials, and fit. Whether you're commuting, hitting the trails, or just enjoying some spirited driving, these gears are built to handle it all without breaking a sweat.

Take the USA Standard 11.25" Dana 80, 3.73 Ratio Rear Ring & Pinion Gear Set and Master Install Kit, for example. This package includes everything you need, including the 3.73 ratio gear set and that handy Master Install Kit with a 4.375" outer diameter inner pinion bearing race (NP673386/NP516549). It’s designed to fit a 3 Series Carrier Case, so just double-check your Bill of Material because the factory thin gear is pretty common in Ford models.