Clearance Item Proven design, low cost and effective performance all make the Detroit Truetrac differentials the ideal choice for a wide variety of vehicle applications both on and off road. No maintenance - Just Traction. The Eaton Detroit Truetrac® limited-slip differential (LSD) is a pioneer in helical gear based traction technology, and remains the leading helical gear-type limited slip diff in the industry. The Truetrac’s proven helical gear design eliminates the need for wearable parts, resulting in maintenance free traction recognized not only for its toughness, but its smooth and quiet operation as well. Vehicle Applications: Chevrolet Camaro, Caprice, Chevelle, Chevy II, Nova, to 1972. Oldsmobile Cutlass, to 1972. Pontiac GTO & Firebird 1972, to 1972. Note: Suits all GM vehicles fitted with 12 Bolt housing, 8.875" Crown Wheel, 30 spline axles and 3.73 & Up ratio.