The Model 40 - John Deere Model 40T Tricycle Tractor Review
More Model 40 Tricycles were built than any other style of tractor in the 40 family. The serial number plate on these tractors simply state "40" . A 40 tractor that has a plate without a C, S, U, V, or H stamped on it, is a T. The configuration of the front end makes no difference. You could get an all-fuel engine as an option on the tractor.