M vs. SM

[guest6789]

Wondering what are the pros and cons of each chasis, Farmall M and Super M for building a puller? Weight, gear speeds? Anything else? Thanks.

 

[Anonymous-0]

The chassis is the same. The m has a 247.7 cubic inch engine. The super m has a 264 cubic inch engine. The 264 engine will take the pistons and sleeves of a 450 making it a 281 cubic inch. The super m has a larger clutch.

 

[6pack]

Neither one is meadow green is the first problem, haha!! couldn't resist. Both are good pullers, the super is a little easier for cheaper power, I think the M can get a little lighter. Is this for stock pulling or should I say 3mph class antique Div I, II, or open class where you need 400-500ci. to unload off the trailer. Good Luck will be fun with which ever you choose!

 

[The Dukester]

For pulling there's not too much difference...the first gear is the same speed in either model. Like a previous poster said the Super M came with an engine block able to take the largest sleeves used in this engine family, the 4 1/8 in. bore jobs that the later 450 models came with. Also the Super M used a 12 inch clutch...which was stronger naturally, but made it necessary to split the tractor to change it, whereas the M with it's 11 inch clutch didn't have to be split. For field work the extra power of the Super M made it a true 3-4 plow tractor and the faster 3rd and 4th gears gave it a better range of field speeds and might be an advantage for pulling in the classes that permit higher track speeds. As I recall the clutch pilot bearing and the input shaft pilot bearing are larger in the Super M too...which might mean something too. for transmission durability.

 

[mshultz]

I'd think you'd be looking to spend some extra $$ to get a SM - at least around here you would. Balance and power potential are pretty well identical in the stock to semimodified classes. I prefer straight M's for their band brakes - not nearly as cantankerous as them disk brakes on the supers.