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Jack up one side only with the car in neutral and attempt to turn the jacked up wheel with a torque wrench on the lug nut....if it's a posi, it should take 30 to 40 lb ft to turn the wheel.

Or, if the car is up on blocks, turn the pinion while holding one should be nearly impossible to turn the pinion by hand if the car has a posi....and the wheels will turn in the SAME direction...

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