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Everything after the 8N has live hydraulice, ie, you don't have to have the clutch released or the pto engaged to operate the 3ph. If the engine is running, you have hydraulics. 1953: Golden Jubilee
1954: NAA After 1954 Ford ceased to be a "one-model" tractor maker. They offered 4 different "series" with several "models" within each series. 1955-57: 600 Series, 134 cu in ohv gas engine. 800 Series, 172 cu in ohv gas engine 700 Series, row crop version of 600 900 Series, row crop version of 800 1958-62: 501 Series, offset tractor with 134 gas engine or 144 diesel engine. 601 Series, 134 gas or 144 diesel 801 Series, 172 gas or diesel 701 Series, row crop version of 601 901 Series, row crop version of 801. The model numbers within each series differ with the middle digit. Example, a 640 is a 600 Series with a 4 speed trans and non-live pto. An 860 is an 800 Series with 5 speed trans and live pto. For live pto you need to look for a 6 in the middle of the model number (660, 860, 960, 661, 861, 961). The 601 and 701 Series' were also called "Workmaster". The 801 and 901 Series' were called "Powermaster". Basically they are the same tractor as the earlier 600/800/700/900 series except a diesel engine became available. The other thing that became available (in '59) was the Select-O-Speed transmission. All SOS tractors have independent pto. Some have a single speed pto (671, 771, 871, 971) and some had dual speed pto (681, 781, 881, 981). I'm pretty sure the SOS was also available on the 501 Offset, but there are so few of those around that I've never seen one. The Vintage Ford Tractor Resource website is a nice information resource. Unfortunately the navigation buttons don't seem to work well anymore. Here are some links to specific pages on that site.
History narrative
Serial and Model number breakdown
Comparisons
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