According to this you could have diesel, gas or lpg
https://www.tractordata.com/farm-tra...eere-4020.html
Total built: 184,879 (total) 8,123 (gas) 8,445 (LP) 168,311 (diesel) 17,732 (standard) Original price: $10,345 (1972 )
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According to this you could have diesel, gas or lpg
https://www.tractordata.com/farm-tra...eere-4020.html
Total built: 184,879 (total) 8,123 (gas) 8,445 (LP) 168,311 (diesel) 17,732 (standard) Original price: $10,345 (1972 )
See production data for the 3020 here https://www.tractordata.com/farm-tra...eere-3020.html
Down like a clown charlie brown