Eaton Detroit Truetrac Differential 30 Spline 1.29in Axle Shaft Dia 3.08-3.90 Ratio Rear 8.875in

If you're looking to improve traction for your classic muscle car or truck, the Eaton Detroit Truetrac differential is a solid choice. This helical-gear style limited-slip unit works automatically to send power to the wheel with the most grip, whether you're accelerating from a stop or navigating tricky terrain. It's designed to handle the demands of a wide range of vehicles, from a 1970 Buick GS 455 to a 1972 Chevrolet Impala, and many more.

What sets the Truetrac apart is its maintenance-free operation. Unlike clutch-based limited-slip differentials, it doesn't require special friction modifiers or fluids. The helical gears smoothly engage under load, providing consistent traction without the chatter or noise sometimes associated with other traction systems. This makes it ideal for daily drivers and performance applications alike, offering improved acceleration and handling without sacrificing comfort.

This particular Truetrac is built for 30-spline axles with a 1.29-inch diameter and is compatible with rear axle assemblies measuring 8.875 inches. It's designed to work with gear ratios ranging from 3.08 to 3.90, giving you flexibility when setting up your drivetrain. Installation involves setting up the differential within your existing rear axle housing, so it's recommended to consult your vehicle's service manual or a professional mechanic for the proper procedure.