the whirring noise was the gears spining with no oil in the case, But the ? is what caused the oil to leave. If something broke in side and cracked the case, I would asume you would hear a bang. Maybe the drain bolt backed it self out. Thats the only thing i can think. Good luck 
98 csvt t-red.. sho-shop intake, b&m, fidanza, spec1 clutch, Torsen, DMD,optimized Y& TB, Brullen, rear strut bar,h&r's,17" konig traffik's.
"I say what I mean and I do what i say"
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