Our Trike rear end has a Dana 30 open differential,  there must be a differential in any rear end used on the street to allow the outside wheel to turn faster when cornering. It pulls on both tires all the time unless you have one wheel on sand or a slick surface, then that tire would spin. It  isn't a positrac or limited slip, a positrac or limited slip has clutches inside the differential to limit wheel spin on one wheel, these are designed for the weight of a car and does not work well on a trike, it would have a tendency to push the trike straight in corners.

We had a 140 HP 145 ft.lbs. of torque 127 cu. in. engine in the Frankenstein trike, it would smoke both tires or if it hooked up, wheelie.
Since it does not have a driveshaft it has no tendencies to lift the right rear tire and spin it like a car without a positrac or limited slip differential.