Slipperential of plastic spur gear version, possible?

[RC-Monster Mike]

The plastic spurs have a wider tooth profile than the steel spur gears.
I wouldn't oil the thrust bearing, as it would attract dirt. Left dry, the cetrifugal force of the spinning diff will keep it clean. The bearing only rotates during slip and will be rotating way under its rated rpms - I have never seen a failed thrust bearing on the slipperential.