One way to tell a later 4020 is the block had a place for compressor starting in 1971.The ones that dont work far outnumber the ones that do in tractors over 40 years old.Eagle made a A/C kit in that era and a one I got out west had what they called aswamp cooler that you dont see in the midwest.Most older cabs are worth what they weigh as they were just too noisy by todays standards which is under 90 decibles.Cabs have come along way.
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