Sherman transmission

It will fit, but you will have to swap out the input shaft on the Sherman combo. The combo will have a 10 spline input shaft on it if it is coming out of an 8N. You would have to swap the input shaft of the combo to a 15 spline input shaft to use it in a 641. See the link below and check out the Sherman section for more info. John may even have a 15 spline input to swap for a 10 spline.
Poke here
 
A 641 below SN 14267 will interchange with a 8N. After 14256, it will need a 15 splined shaft.
 

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