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another expert here
1st thing to check is the rear tyre sizes from side to side as its an electronic locking diff so any speed differential between the 2 sides will try an lock the diff up
but are they the same on each side of the axle?
if the rolling diameter is different side to side it will tie the diff control in knots
but if thats OK then I'd next check that the rear brakes aren't binding and also check the level of the oil in the diff is up to the mark
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