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 Connect with Big Tractor Power @ http://www.bigtractorpower.com