Hi folks, which series in each of the tractor sizes first came with differential steering? Are current models equipped with it too? Reason I ask is that mouldboard plowing would seem to be an ideal application for diff steering because it could make for a very smooth pass down the furrow. Has anyone had direct experience of this and what, if any, disadvantages are there?
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Thanks Wombat, I'm a little surprised that I haven't found a youtube of someone ploughing with one. I watch the Italian videos and they're as jerky as heck trying to stay on course and I figured a diff steer would be an ideal application (if one was to use a steel-tracked tractor)

Thanks Eddie, I looked at that one and about three others figuring out which components are connected to others. One guy made a model where the incoming bevel drive drove the planetary carrier for the center planetary, and the three sun gears are all on the same shaft, with the steering motor driving the right side ring gear. I can't tell if this is the same design as Cat's but I imagine it can't be too far different. Other designs have only two planetaries and the steering motor drives the two ring gears in opposite directions - seems like a simpler system than the three planetary system. Did the engineers ever state how much power it takes to run the steering motor (would differ for different models of course)?