If the W6 and M are the same year tractor or near, the trans. and rear housings will be the same. Most others work. You can do what you want with the right parts but is simpler if both tractors are not real early versions. Bull gears and pinions are the same on both. For most M and W6 tractors with standard transmission gears, use the pinion gear or main shaft from the M along with the differential. Use the M transmission gears, reverse idler and input shaft. Or you can mix some transmission gears. Since you don't have the W6 pinion you can't put the W6 set in the M. W6 standard transmission gears 1,3 and 4 are one tooth different on bottom and top than a M. Gear 1 turns the main shaft slower, 3 and 4 faster.
I put the slightly slower W6 first gear in my M. Put the W6 first and second gear on the counter shaft, first and reverse sliding gear and reverse idler gear in a M with other gears M.
Also you need to use the M axle housings and axles from the M on the W6 housing.
W6 pinion 19, ring 47. M pinion 19, ring 50. 19 tooth main shafts don't mix with the different ring gears.
Should add that W6 tractors built sometime in 1942 and older used the same speed first as a M with standard gear speeds.
This post was edited by D Slater at 15:51:25 11/13/10.
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