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They made Step-up and step-down and combo Shermans for 9N, 2N, and 8N. They even made a reversing unit so you could turn the machine around and make a forklift out of it. DO you need one for bush-hogging with a 9N? No. While a 3-speed tranny isn't ideal, the 9N has enough power to use a 5' bush-hog. 6'may be questionable. What you will need is a Zane-Thang position control or limiter chains to set the height, and an over-running coupler so the bush-hog won't use its flywheel moment-energy to propel the tractor forward, even while the clutch is depressed. Also, the non-live PTO will stop when the clutch is depressed, so it becomes annoying and difficult to deal with heavy grass or when you wrap up the mower in fence wire or vines. In such a case. to raise the mower, you then have to unhook the PTO shaft, engage the PTO/pump control and raise the mower. An ORC will cost you about $60 and you can get one that adapts the 9N 1-1/8" PTO shaft to the standard 1-3/8". Or you can swap out the PTO shaft for around $100 and use a standard 1-3/8" x 1-3/8" ORC.
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