viscodrive was basically a wet slipper, hydradrive was basically a vaned disk in a finned enclosure running in diff oil and seemed to work better, it was lighter too. it takes a lot of the kick away, just like a normal slipper but a lot more effectively. I had one on an old ultima with a stealth box in it for a while, you could just give it more stick without upsetting the car. might help a bit with your wheelspin as it would take away the initial punch which helps break traction
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