If you have the G80(locker), it will clunk when it engages pretty loudly. If one wheel is off the ground the free wheel should spin approx once and then clunk the other kicks in. If one just spins in the air, it's broke.
BTW that jackstand trick is no good with a locker  Sam
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5.3, 4L60E, ATI P-1SC w/intercooling, 42 lb injectors, LS1Edit Autometer Phantom boost and fuel pressure gauges.
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