I am in the final stages of rebuilding an Allis-Chalmers #3 sickle-bar mower. I plan to use it behind a Farmall F-14.I bolted the mower up to the drawbar today to see if things would line up. It lines up nice, except that the pto shaft is going to have to be a LOT longer. The original shafts are about 24" each (male and female). Allowing for adequate overlap, that means the center-to-center distance on the u-joints was originally about 30", maybe as much as 36". Center-to-center now is more like 51". Making the new shaft is not a problem, I have to redo the female part anyway, as it was all goobered up. My question is, with a shaft that long, made of what appears to be 1" ID square tubing, am I going to have a problem with shaft whip? I figured to overlap all but about the last 6" to minimize it as much as possible, but I'm still concerned. Opinions? Ideas?
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