Hi Dave: Yes, the two that form a triangle with the drawbar are meant to keep the drawbar locked down for when you are towing. They generally come with a chain to lock your touch-control lever down so that you don't absent-mindedly try to lift the drawbar while they are attached and bend the stabilizers. As Bob said, the anti-sway bars, attached to the lower lift pins and then to brackets under the axles, prevent side-to-side sway of whatever implement is on your 3-pt lift. They will keep your bush hog from swinging out wide as you mow the corner of a field, or keep your back blade dead behind your tractor so you know where it is at all times when doing grading. I use mine with my boom pole to keep it from swinging, and it works real well with my 3-pt carry-all when I'm carrying something on the platform and don't want to worry about it moving around side-to-side. You don't have to put two of these on. Many people get by with just one installed. If you go this route, I'd recommend getting the right-side one, so that you can use your leveling crank to help line up the holes when attaching implements. You will also need something to lock the anti-sway bar to the lift arm when you don't have an implement attached, to prevent it from dragging on the ground and banging around. Some folks just use a little piece of baling wire to attach them. I use an old towing receiver pin (kind that locks your ball hitch into the 2x2 receiver of your truck) that I drilled a hole in the other end, and use a hitch pin to hold it. You could also use a piece of threaded rod, with holes drilled in each end for hitch pins, or twine, your mother-in-law's pearl necklace, etc. Hope this helps..... ..... Ed '52 8N475798
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