The john deere 4020 is one of john deeres most famous mid sized tractors with over 180000 having been produced and sold during its production years from 1963 1972 originally a 2wd tractor the 4020 came with optional 4wd in later years of its production. John deere 4020 tractor hp price review specs history serial numbers weight features images the john deere 4020 was an agricultural tractor model built by john deere manufacturing company from 1964 to 1972. Remember writing review of the john deere 4020 tractor write another of its pros and cons write your review on the purchase price of the john deere 4020 tractor and the costs associated with its use and servicing be as it uses during the harvest and typical field work write about your own experiences with the use or the experience of friends