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I have a PDF file that looks to be a scan of a copy of a copy, of a manual that lists model prefixes for lots of Ford tractors, along with the "advertised" model number that the prefix was for, the yeas of production for that model, what prior model it replaced if there was one, and engine type (gas, diesel, both) and displacement and bore and stroke. It looks like something a Ford dealer would use to look up information on a tractor if a customer brought one in for parts or service and didn't know what they had.
The funny thing is there's at least a few things that I know for sure are wrong in it, like it says that a D10 prefix is a 4000, but it claims that it was made from 1960-1964 and had a 172 ci engine. But all of the other 1965-1975 4000 series models it has correct for the years like the D11 for the 4110 LCG, and D40 for the 4400, D50 for the 4500, etc., except it calls the D41 prefix a 4000, but labels it as "Industrial" in the description column instead of "Special Utility" or even "Utility", as the D41 prefix is really the 4000SU. It also has 2 entries each for D40 (4400) and D50 (4500), and both entries of each show as being made from '65-'75, but the second entry for each incorrectly claims it had a 192 ci diesel engine.
There are some handwritten notes and corrections as well, like the DD1 and DD2 both originally had 515/535/550 typed in as the models, and the 515 and 550 were scratched out by hand on both entries.
It looks like the document was made in 1990 and pretty much covers all models made going back to the 9n and up to the xx30 series that started production in 1990. I'd be happy to send a copy to anyone who wants it, but as I said, there's a number of incorrect things in it, and that's only on the models that I know for sure what the correct information is, so there may be more incorrect info in it than even I'm aware of. I'm trying to put together a corrected list that at least has the corrections that I know to be true, but I seem to have run out of the precious commodity known a "spare time".