If you want to learn more regarding your tractor"s ID numbers, go to the following internet site:
Noveau Redneck"s Cosmopolitan Workshop
Ford model designations changed after 1975. The DL1 designation is for a 531 Industrial tractor, Low Center of Gravity (LCG) manufactured 1975-1976. 1=diesel, 3=live PTO, C=8 speed transmission. Check it out..