By the serial number and you could also check on various castings such as the rear axle trumpets for dates. My 2N left axle trumpet has a May 47 date cast into it so I can be pretty certain it was a 2N, at least that part of the tractor was! I think my tractor had its front end rebuilt, when I bought it I recall seeing something was bent that I thought was odd and the guy said his dad had hit a tree one time years ago. I said Oh and just shrugged my shoulders. Not a big deal, right? When I started looking at this site frequently I discovered the I-beam radius rods which are on my 47 2N were actually only used on earlier 9N models. My engine serial number meshes with a 47 2N however so I am pretty confident that is what most of the tractor is. I believe my front axles, radius arms, steering links, etc came from a 9N donor however. It all drives the same, and it really doesnt make any difference to me if its a 9N or a 2N. They are so similar, that as long as everything works properly I don"t think whether its a 9N or a 2N affects value in any way.
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