[thenrie]

An old 4WD trick was to weld the spider gears in the diff of the vehicle to make a "locked" differential. I haven't checked to see whether that would work on a cub rear. However, if you did that, you wouldn't be able to turn at all in the snow or hard surface. Tractor would want to go straight all the time. Even if it turned, your turning radius would be increased a lot. Your best bet is weight on the rear. Lots of it, and narrow tires and chains.

Next best thing would be turning brakes, like Matt G made for his 682, like the SGTs have. See his web site. When one side starts slipping the side with traction stops, so you hit the brake for the side that slips and it makes the other tire turn. Helps tons with the traction and getting un-stuck. That's a mod I plan for my 1650 and 682...eventually.