slowing down m

From the parts listing, the M has 50 teeth, the 560 has 49 teeth. As such the 560 gear set will speed up the tractor. Will they fit, I do not know, but the pinion is built onto the trans output shaft, and that must also be compatible with the driven gears! A rear axle assembly with planetary gear reduction (wheatland series?) Jim
 
Think the 560 ring gear will bolt to a M differential carrier. But no way will a 560 main shaft work in a M without major rework. Short of a low low first attachment or special gears some W-6 have a first gear with one tooth less on the counter shaft driving one tooth more on the top shaft. Will work in a M with the matching reverse idler also installed.
 
I would look at pulling the lift all and putting an over/under drive unit in there. There are aftermarket units that are about 12" long and 6" in diameter.
 

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