If the slipper shaft isn't turning when you rotate the rear wheels are you getting full drive to them when you power up the motor?
Equally have you cranked up the slipper really tight so it won't slip and thus the shaft won't turn?
I normally set my diffs between a 1/3rd of a turn and the three quarters undone from being fully tight. Just pop the ball stud on the screw side, holding the opposite wheel tighten and undo to required amount.
Remember you want the slipper to slip before the diff and ideally you want to set the slipper up on the track as you'll probably find you'd want the slipper to slip more on a slippy track than a high grip one.
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