Tractor having a convertible front end and variable track width and related methods

A tractor having a front end and a rear end, said tractor being adaptable to a plurality of front wheel assemblies, said tractor comprising:

• one of said plurality of front wheel assemblies;
• an attachment mechanism at said front end of said tractor, said attachment mechanism configured to selectively attach said one of said plurality of front wheel assemblies to said front end of said tractor;
• a steering actuator, said steering actuator being fixedly attached to a steering mechanism of said tractor, and being selectively attached to said one of said plurality of front wheel assemblies;
• and
• a power transmission unit, the power transmission unit comprising:
• a clutch assembly;
• a gear box in communication with the clutch assembly, said gear box comprising:
• an input shaft for providing power from an engine of said tractor,
• a first output shaft in communication with said input shaft, said first output shaft comprising two gears, a first gear for providing a low range speed and a second gear for providing a high range speed;
• a lay shaft in communication with said first output shaft, said lay shaft comprising a first gear, a second, and a reverse gear;
• and
• a second output shaft in communication with said lay shaft and in removable communication with said first output shaft, said second output shaft comprising a first shifter gear in removable communication with said first gear of the lay shaft and said reverse gear of said lay shaft, and a second shifter gear in
• removable communication with said second gear of said lay shaft and a set of splines;
• and
• a rear end differential box in communication with said gear box, said rear end differential box comprising a set of final gears for delivering power to said rear end of said tractor, wherein each of said gears of the gear box and said rear end differential is viewable when a top cover of each of said gear box and said rear end differential box is removed.