I doubt you can find one, I need to find one for my KUHN FC300G, but the gear box can be swapped from 540 to 1000 by just turning it around and reversing the PTO shaft.
It has splines for both right on the pumpkin.
The splines I need to be able to run mine on the 540 PTO tractor are messed up on the pumpkin, so am committed to just running it on the 1000 RPM IH1066 side.
Otherwise, this has been brought up on several other different forums at least as far back as 2007. Not just YT.
You could try to "build" one if you are a good machinist. You would need to weld up a frame to mount 2 pillow block bearings at the top and 2 at the bottom, with a shaft through each. Figure out just how much speed "increase" you need. Idle speed won't work well.
Then get the proper size sprockets to run a short roller chain between the two, meaning both the bearings and the shafts. Plus the PTO hookup.
None of that stuff is cheap.
You are then still left with figuring out how to secure this framework from "flipping" over under a load.
I think that is the main reason you don't find this already for sale. It needs to be short, stout, and not flip over. DOUG
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