Is there a no brainer way of checking your rearend without taking it apart? I've been told if I jack the rear of the car and have someone hold one tire I shouldn't be able to rotate the other if the trac-lok is working properly. Is this correct, if so do I need to be out of gear? And if I can turn the tire does that mean the clutches in the rear need replaced? Would that be covered under my extended powertrain warranty?