You are putting a lot more load on things with the tracks. And that is a limited slip axle!
Actually, the loads have changed, but I'm not sure if there are more.
All the weight is supported by the rail, there is no weight load on the axles. The only loads on the axles are fore and aft directly as the sprocket takes up load the tracks.
The actual drive sprocket diameter is roughly 1/2 of the original tire diameter. From what I've seen the torque loads on the axle haven't changed much. The ground speed is roughly 1/2 half that of a wheeled tractor. There is extra drag from the tracks that has to be factored in, but I figure the reduced torque load from the 1/2 wheel speed should compensate for that. Basically all I did was change a pulley drive (wheels) to a chain drive (tracks) with 1/2 the diameter of a drive sprocket.
Not having a stock tractor to pull against, I can't say for sure..
Edited by Chopperhed, June 23, 2015 - 05:08 PM.