The 821D model number doesn't match the 1801 Series decals. '8' stands for 172 cubic inch engine, all-purpose tractor with adjustable front axle that has tie-rod steering and sheet metal grill and nose. The 1801 has the heavy, cast nose, heavy-duty non-adjustable front axle and full power steering like you described. '2' stands for four-speed transmission without pto or hydraulic lift, '1' stands for x01 and xx01 tractors made 1962-1964 and 'D' stands for diesel. The 801 Series tractors have the same drivetrain as the 1801 Series. Select-O-Speed (SOS) transmissions have a shift mechanism centered on the vertical sheetmetal below the steering wheel. 4-speed manual transmissions have the shift lever on top of the transmission. One of the most popular ways to "repair" an SOS is to relace it with a standard transmission. Check for a rectangular hole in the vertical sheetmetal, or a patch where the SOS shifter would have been. With standard transmissions, the sheetmetal doesn't have a hole. Tractors with standard transmission and pto have the pto shift lever in the round cover on the left side of the center(differential) housing below the seat. SOS tractors have a short shaft sticking through the round cover--the shaft has flats that fit a 7/16 openend wrench. The model number and serial number is only on the transmission. The serial number precisely dates the tractor. My guess is that it's an 1871, with the '7' standing for SOS transmission with pto--the pto shaft was left in place but not connected. You'll know when it's running, or remove the round side cover to see if upper trans. output shaft and lower pto shaft are coupled to the differential. Tony Jacobs, who's an authority on older Ford tractors, has written that the red/yellow industrial colors were used from December, 1960, for the 1961 model year, to June, 1962 at about serial number 177,000, when the industrial colors were changed to blue/yellow and the ag tractors were changed to blue/grey.
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