You can use the tiller off of the 400 if you make a yoke with male PTO end. That's what I did with mine to run it on a 455. Works perfect and looks original! The nice thing is you can put it back to original just by sliding the original yoke bake on!
How did the tiller work in regard to performance compared to the 400 tractor? As I recall the 400 PTO spins at 840 rpm, somewhat faster than the 540 intended for most tillers. Was the male 6-splined yoke readily available, I once searched around without much luck?
John Deere offers a 7" long or so dual end 6-spline 1-3/8" stub shaft that can be inserted in the tractors female PTO, emulating a more typical male PTO stub at the tractor side. At this juncture any standard 6-spline female PTO driveshaft can be utilized.
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