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Wheel Rotation Method
4 Place the vehicle in "Park" if it is has an automatic transmission, or in first gear if it has a manual transmission.
5 Brace the two tires, with wheel chocks, on the axle you will not be inspecting. Jack the vehicle to lift the two tires--on the axle with the differential you are inspecting--off the ground.
6 Turn the tire on one of the lifted wheels slowly. Use your hand to turn the tire. If the differential is limited slip, the wheel will be difficult to turn. If the differential is an open differential--also known as a conventional differential--the wheel will turn freely.
7 Place the vehicle in neutral.
8 Turn the tire again. The tire should turn more freely on a limited slip. Also, the opposite tire will turn in the same direction. If your vehicle is equipped with an open differential, the wheel on the other side of the axle will turn in the opposite direction.
Read more: How to Identify a Limited Slip Differential | eHow.com
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