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964 C4 Thumping noise

Transmission and Clutch

Vehicle Information: Year: 1994; Body Type: Coupe; Engine (type, size, modifications): 3.6 bored throttle body, airbox mod, stainless headers &exhaust; Total Mileage: 14M;

I recently mounted a set of "R" compound tires sizes 225x40x18 & 265x35x18. I have also been running "street" tires in the same sizes for some time without any issues. I took the car to the track last week for a PCA DE and experienced a thumping noise from the AWD which I would normally associate with mismatched tire sizes producing different wheel speeds. This is not the case so....what else could it be? I am told there is a "wet clutch" system for the awd which may be causing this. Thanks in advance for your help.

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