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Hi, We had a 1966 powershift 4020, and a 1965 synchro 4020. My dad dealt with the problem of a bit lower pulling capability in the power shift by having the dealer "Open Up" the fuel pump setting to increase engine HP by 5 or 10 HP. Tractor was used for over 20 years before my dad retired from the farm in the 90's... The synchro was a strong tractor when field cultivating, but it was tough to grab a lower gear when you bogged down, as the shift pattern pairs 2 and 5th gear, 1 and 3, and 4 and 7. The powershift was easy to move from 4 to 3 when you hit a soft spot in the field with disc or field cultivator... For valuation, I'd think that the powershift tractors now have a premium, as they make the tractor so much more useful for hobby farm, acreage type activity like haying, mowing, or loader work... Most folks don't farm small enough to use a 100 horse tractor as the primary machine, and the 4020 is now a higher horsepower version of what we affectionately called a "Chore" tractor on our farm... The one that did all the little chores around the place except for field work.
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