The 2020 was built between 1965 and 1971. It had the 180.4cid gas engine @ 53.9 pto hp or the 202.6 cid diesel @ 54.1 pto hp. Serial numbers are: 1965-#14502 1966-#14680 1967-#42721 1968-#65176 1969-#82402 1970-#102032 1971-#117500It was manufactured in LOW UTILITY, ROW CROP, HIGH-CLEAR, and GROVE UTILITY versions. It was replaced, in 1972 by the 2030. The 4230 was made between 1973 and 1977. This is the tractor which replaced the 4020. You could, briefly, buy it with either a gas 362cid or a diesel 404cid engine. The gas tractor was rated @ 100pto hp, the diesel tested @ 100.3. The "Sound Guard" body (cab) was standard ( you could optionally delete the cab), there were 3 versions, ROW CROP, HIGH CLEAR, and LOW PROFILE. You could get Syncrorange 8/2, powershift 8/4 or Quadrange 16/6 transmissions. Serial numbers: 1973-#1000 1974-#13000 1975-#22074 1976-#28957 1977-#35588 I hope this information helps. Source: HOTLINE FARM EQUIPMENT GUIDE, 1999 ed.
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