1957 Ford Model 640

Buz Caldwell

New User
I have a 1957 Ford Model 640 with the standard 4 speed transmission. I'm considering purchasing and installing a Sherman High / Low transmission. The Sherman transmission I've located has a fine spline output shaft. Will this Sherman transmission fit this model Ford Tractor?
 
Your 640 has the coarse spline input shaft so it will not fit as-is. You would need to replace the Sherman fine spline input shaft with a coarse one or possibly you could replace your coarse spline clutch disc with a fine spline disc out of a 641.
 
Texas,
Thank you. Very helpful information. I can tell I will be spending lots of time on this forum as I go through the restoration of this tractory.
 

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