I was not trying to suggest these never existed, there is no question many devices were built for pre letter series tractors, as owners changed them from steel to rubber tires, only to realize they had no road gear. Probably a lot of those tractor had a top gear speed of 7 to 8 mph. And yes they gained up to 5 to 7 mph, giving them speeds of 12 to 14 mph. Your 450 however should already do about 16 to 18 mph in 5th gear. I was merely suggesting you would not gain much with the 450. There were also some photos on here at YT back 2 to 3 years ago. My memory is a little rough on this, but he had a drive mechanism from the belt pulley to the right rear wheel. I've forgotten exactly how this worked, but it seems he had an idler that griped on face of rear tire. And again he was trying to compensate for a tractor without a road gear. Someone must remember this better than I. You might try typing a search in photo gallery, as I have a feeling photos of this are there. Try looking for F-20 or F-30, or W-20, W-30 or W-40. This is gradually coming to me and just may have been a W-30 or W-40. First one I would try is W-30. You might also have a look through Articles on the left of screen as it may be in there. I saw another idea I wouldn't strongly recomend. I was coming out a side road one day, stopped at stop sign. I could have gone but was curious to have a better look at what I thought I could see coming down the highway. I waited, and yes, a Dodge mini wan with a 2 wheel tow dolly and the wide front of a MH 33 standard, straped in the cradles. I followed at a safe distance and he was making speeds of 60 mph. In the end I followed him 30 miles, didn't think it safe to pass, and heaven forbid that one would ever want to be in front of him and have to slow down quickly. Knowing the front end of those old MH were never the most solid item in the world, I was trying as I drove to decide which would happen first. Tractor separate from front end or transmission-rear end gears bust the castings wide open and be launched in space. He turned of highway at a little town, so I presume he made it safely. I asked later who he was, turns out he was a preacher, I guess the lord must have been travelling with him that day.
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