John Deere 4320 Specs, Price, Reviews: John Deere 4320 tractor featured with 6-cylinder John Deere turbocharged diesel, liquid-cooled 404 ci [6.6 L] engine, 8 forward and 2 reverse gears, and John Deere Syncro-Range transmission. The John Deere 4320 tractor was designed to fill a horsepower gap in the Deere lineup between the Deere 4020 and the Deere 4520/4620. John Deere … [Read more...] about John Deere 4320 Price, Specs, Review & Images