I think he was probably describing the Syncro-Range shifter because he mentioned "odd gears". The Syncro transmission shifts between 1 and 3, 2 and 5, 4 and 7 and 6 in 8 each in their separate syncronized range gear. The first 2 Syncro ranges (or 3 depending on linkage) have a reverse gear also. The idea is you can shift between those gears in a range without stopping, but if you want to change ranges, you have to come to a complete stop. So you can shift from 6th gear to 8th gear on the move, but if you want to get into 7th, you have to stop first.
The Powershift control was just a lever that had 1-3 reverse on one side and 1-8 forward on another and park below. You never have to stop or use the clutch to shift between any gear, but it's a really good idea to stop before shifting between forward and reverse :).
I have a 4010 syncro and a 4020 powershift. The 4020 has about 10 more HP and is a lot more comfortable to use. They worked out a lot of annoyances and problems with the 20-series, which I think is why the 20's are worth so much more. Just less headaches. My 4010 has perpetual problems with the hydraulic pump (rebuilt about 3 times I think) The brakes on the 4010 are very touchy and if the engine ever dies, you have NO BRAKES. The interchangable PTO shaft on the 4010 is a bad design and uses 4 bolts to hold the shaft in instead of the snap ring the 4020 uses so it's prone to loosening up and leaking. The 4020 has a much nicer 3pt lift arm setup (used all the way up to the 50 series?) and doesn't drop expensive parts off the lift arms out in the field for you to plow under. That's all I can think of right now, but having used both tractors for a very long time, it makes sense to me why the 4020 resale is much higher.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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