USA Standard Spartan Locker For Ford 9in / 28 or 31 Spline

You're getting a USA Standard Spartan Locker from Yukon Gear & Axle, designed to fit Ford 9-inch differentials with either 28 or 31 spline axles. This is a mechanical locker, meaning it provides a solid, 100% lockup for your rear differential. When engaged, both rear wheels turn at the same speed, which is crucial for maintaining traction in challenging off-road conditions or when you need maximum grip on slippery surfaces. This type of locker is a popular choice for those looking to significantly improve their vehicle's off-road capability without the complexity of air lockers.

The Spartan Locker is a type of 'lunchbox' locker, which means it's designed to install directly into your existing differential case without requiring you to remove the entire differential carrier. This often simplifies the installation process. Yukon Gear & Axle has updated the design to eliminate the need for thrust washers, and it uses a unique spring and pin system. This updated design is intended to make the installation process more straightforward compared to older locker designs. It's built to provide consistent, reliable traction when you need it most, making it a solid option for serious off-roaders.

This locker fits a wide range of Ford vehicles, including popular models like the Ford Bronco, F-150, and Mustang, spanning many years of production. While it offers a significant traction advantage, remember that a 100% locked differential will affect on-road handling, especially during turns. It's designed for off-road use where maximum traction is the priority. Ensure you consult the manufacturer's installation instructions for the best results and to understand any specific requirements for your vehicle's differential setup.