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Description: Normal operation of this unit is as a locker, but it contains a ratcheting mechanism that allows the wheels to turn at different speeds when cornering. These differentials are best suited to drag racing and can be noisy on the street, and the ratcheting action can cause a pushing sensation while cornering. They are also very sensitive to air pressure and discrepancies in tire diameter. McMillan says to do a rollout test on your rear tires to make sure they measure the same in circumference.