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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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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