Mine is a 2 wheel drive with turf tires all the way around. The serial number breakdown is from the Hotline Farm Equipment Guide. They are a great source for serial numbers, models, high/low prices, etc. What else is handy is that they have good info on combines, balers, planters and windrowers too. The one I have is from about 1990 and has info all the way back to the 1930's.