Why the Detroit Truetrac? This highly engineered unit will provide maximum power to the ground while enhancing driving and handling characteristics. Vehicle Uses The Detroit Truetrac is designed for a variety of uses. Professional racing, high-performance street and off-road vehicles will all benefit by installing a Truetrac. It’s smooth, automatic operation and proven strength make the Truetrac for Ford 9” – 35 Spline ideal for upgrading existing units, building custom powertrains or converting truck / heavy-car axles. Operation Helical-style gears drive the Detroit Truetrac. When needed, the gear separation forces automatically transfer torque to the high traction wheel. Features and Specs. Unit is light-weight at only 14.6 lbs Designed with five (5) pinion-gear sets for incredible strength Parts are maintenance free meaning more time on the road Validated performance and durability Helical-style gears; limited-slip operation