1. SF, NF, and WF are interchangeable. 2. SM had more HP and faster 3rd and 4th gears, Factory drawbar HP for the M was 34.44, for the SM, 42. Other differences, except the hydraulics (below) were minor. Serial plate is on left side of clutch housing, The serial prefix FBK means M, prefix SM means Super M. Don't let the decals fool you. 3. add on. 4. No more than any 50-60 year old tractor. 5. Hydraulics were always an option, but 95% probably had them. M and early SM had a belly pump, not live. Later SM's, Stage 2, had live hydraulics. Live PTO did not appear until the SMTA in 1954. 6. 2.625, 3.75, 5, 6.75, 16.75. 3rd in a SM is as fast as 4th in the M, except that a few of the M's had a 7mph 4th gear -- that is rare.
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