Eaton Detroit Truetrac Differential 35 Spline 1.50in Axle Shaft Diameter 3.25 & Up Ratio

If you're looking to get more grip out of your 1972-1982 Ford Courier, especially when you're heading off-road or dealing with slippery conditions, the Eaton Detroit Truetrac differential is a solid choice. This isn't your typical open differential that sends all the power to the wheel with the least traction. Instead, it uses a clever system of helical gears to automatically send torque to the wheel that has more grip, giving you a significant boost in traction without any sudden or jerky engagement.

What makes the Truetrac stand out is its maintenance-free operation. You don't need any special fluids or friction modifiers like you would with some other types of limited-slip differentials. It works smoothly and quietly in both forward and reverse, making it a versatile upgrade for almost any truck. The helical gear design is known for its durability and smooth engagement, so you can count on it to perform consistently. This particular unit is designed for axles with 35 splines and 1.50-inch axle shaft diameter, and it works with ring and pinion gear ratios of 3.25 and numerically higher.

When installing this differential, it's important to ensure your axle housing is clean and that you're using the correct gear oil as recommended by Eaton. Because it's a helical gear design, it doesn't require the special friction modifiers that clutch-type limited-slip units do, simplifying the fluid choice. This differential is a great way to improve your Courier's ability to put power down, whether you're towing, hauling, or just exploring.