it sounds like a diff setting, are you just going in a straight line applying the throttle and the rear comes round.
the diff is driving both wheels and not allowing any difference in rotation between either of the rear wheels because it is acting like a solid axle due to the drag of the oil on the gears.
Use thinner oil or remove two of the gears is a solution also having a ball diff for low grip is an option, check out the Schumacher set up section for the KF in damp conditions where a ball diff was the option.
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