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M Transmission question

M

Matt Reinders

Member
I am working on replacing transmission gears on an M. I have a parts catelog for an H model. The exploded diagrams look identical as far as the parts I need to replace in the gearing. So my question is, are the transmission gears the same in an M as an H?
 
No! While they look identical, virtually every component inside an M transmission is bigger than in an H.
 
Everything in the trans of an M is bigger than the same part in an H. NOTHING except some hardware would interchange.
 
And the lower trans shaft and gears on an M are splined while the gears and shaft on the H are just keyed.
 
FYI M and SM IH counter shafts are keyed and the gears pressed on or off. SMTA was the first splined countershaft in that series.
 
Go to Messick's.com and type in Farmall m and you will have a parts catalog for your tractor. That site always works for me but the CASEIH site has same catalog but does not always work. I don't know where you are but I have some M gears up here in Minn.
 
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