Proven design, low cost and effective performance all make the Harrop Eaton Truetrac differentials the ideal choice for a wide variety of vehicle applications both on and off road. No maintenance - Just Traction. The Harrop/Eaton Truetrac was the first helical gear differential ever introduced into the automotive aftermarket. It is based on technology derived from the Eaton Detroit Truetrac® limited-slip differential (LSD) which 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 recognised not only for its toughness, but its smooth and quiet operation as well. Vehicle Applications: Landrover Discovery Series 1, 1993 - 1998 models with Rover type rear differential housing and 10 spline axles, 3.54 Ratio. Note: Suits axle serial numbers and later: Range Rover - suffix F, 88 - suffix G, 109 V8/1 ton - (Salisbury standard), 109 4 cyl. ¾ ton - (Salisbury optional) Differential rebuild kits and/or bearings may be required when fitting this product. These parts will need to be sourced separately.