Thanks Dave for correcting me. Your right, I meant to say the 1864 has power steering. I'm not sure of the difference between the 1860 and the 1861. The only thing I could even think of might be the front axle. they might have changed the axle on the 1861 to the "Super Steer" axle, but this is just a guess, so don't quote me on that. I was just looking in my book and noticed a weird thing. My book says the 1863 has a "Hydro-Gear" hydrostatic pump, while the 1864 has a "Sunstrand" hydro pump. I can't confirm that this is true, but that is what my book says.
Ok, I'm being lazy and not changing what I typed, but I just noticed the 1860 has a manual lift and the 1861 has a hydraulic lift. That's the difference.
AJ