Eaton Detroit Truetrac Differential 33 Spline 1.41in Axle Shaft Dia 4.10 & Up Ratio Rear 8.875in

If you're looking to improve traction for your classic GM vehicle, especially when dealing with varied road conditions or spirited driving, the Eaton Detroit Truetrac differential is a solid choice. This helical-gear style limited-slip unit is designed to automatically send power to the wheel with the most grip, enhancing both acceleration and handling without any special driver input. It works seamlessly in both forward and reverse, making it a versatile upgrade for a wide range of vehicles from 1964 through 1972, including popular models like the Chevrolet Impala, Buick Skylark, and Oldsmobile Cutlass.

What sets the Truetrac apart is its maintenance-free operation; it doesn't require special lubrication or friction modifiers, which simplifies installation and ownership. The helical gears are well-known for their smooth and quiet engagement, meaning you get the benefits of improved traction without the noise or chatter often associated with other types of limited-slip differentials. This unit is built for durability and is designed to handle the demands of daily driving as well as more performance-oriented use, making it an ideal traction solution for many applications.

This particular Truetrac is set up for rear axles with an 8.875-inch ring gear diameter, featuring 33 splines and compatible with axle shafts measuring 1.41 inches in diameter. It's engineered to work with ring and pinion gear ratios of 4.10 and numerically higher. When installing, ensure you follow the manufacturer's guidelines for proper setup and gear pattern checking to get the most out of its performance and longevity.