OK, gear oil replaced and rear tires swapped side to side. Not sure this did the trick, but I'll drive it for a couple 100 miles and see what happens and let that new fluid permeate everywhere. Not feeling confident this is the fix, but worth a shot. I'll post back up in a few days. My gut tells me it's heading to my indy for diagnosis and repair. The options combo on this car is rare enough where I want to keep it.
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