Got the OS Giken broken in (500 miles), changed the fluid (picture of drain plug attached), drove 50 miles to Road Atlanta. Did two 15-minute sessions, let the car cool down for about an hour, jumped in for a 3rd session, started the car and heard a grinding sound from the rear as the car started moving... Had the car towed back home, drained the fluid (very dark and thick), the drain plug split into 3 pieces... That's a first one. Looks like the diff clutches seizes from overheating, will know more when I send the diff back to Shaftworks for a post mortem...
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