In this Big Tractor Power video we are out in the 2018 wheat harvest with a John Deere S780 combine and a John Deere 6600 combine. We will climb up in the cab of a 2018 model year John Deere S780 473 hp 400 bu. combine and a 1978 John Deere 6600 120 hp 112 bu. combine to compare how the combines have changed over the past 40 years. What is your favorite John Deere combine?