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You need a tractor with a creeper gear option. There are few. You need about 1/2 mph with the engine at PTO speed. You won't get there with the auxiliary under/over transmission on an 8N because that transmission slows the PTO also. You want a tractor with a live PTO otherwise you will be pushing fence posts down at the end of the rows because the intertia of the spinning tiller will drive the tractor trough the simplistic PTO of the unlive PTO like the 8N has and you won't stop where you want. You can solve that stopping problem with an overrunning clutch, but you still need to have the tiller up to speed before putting it into the ground and beginning to move and you can't get that without a live PTO. You might be better off to think of a tiller mounted power unit and then you can throttle the tractor back for lower ground speed. Do a tractor search on "creeper" and you will find the tractors that have or had creeper gears as options... Might not find any in the AC B, Ford 8N era... Though I believe that was an option on some JD like 520 or 620... Close to the 8N era. Something like a 520/530 or 620/630, the creeper gear might be a field modification possiblity, just change a couple gears and shafts, if the creeper gears can be had from JD or a used machine. Most tractors run 1.2 to 1.6 mph in their lowest gear at PTO speed and you need 0.5 so you need a lot of speed reduction without slowing the PTO. A tracked drive like that on the IH quadtrack where the drive sprocket is much smaller than the original wheel would accomplish the needed speed reduction, but I've not seen any suitable parts already made... Gerald
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