All that would depend on the ground type, how deep and wheel slipage. SM from the differential back is mostly the same as a 450 farmall. Some ground here a 3 bottom is all a 450 wants at 8 inches. 560 parts after the serial break or early updated differential, differential carriers, bull and pinion gears and bearings will work in a SM. If you want it to look stock on the outside have the OD of the bull pinion retainers turned down to SM OD size. If you use one keyway axles from a 560 different wheels is needed. After a serial # break 560 came with the parts and no triangle was put on them. Some other improvements were added toward end of production. Also there was a serial break that the rear housings were changed. Main shaft rear bearing and retainer was change and wall of housing strengthened for retainer that mounted with 4 bolts instead of 3. Same as the 660 was using.
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