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What's your truck's serial number?
:confused:

Unknown. As I jokingly referred to above, the PO thought it was a 50, the title we got is for a 51, the serial number plate is missing, and my dad told me it's a 53. Dad was right (as dads often are), at least going by the identification guides posted here and elsewhere.

Oh, and thanks for the explanation. Several casting number/serial number sites got me close to this information, but yours is the clearest explanation.