Combines differences between 6600 6620 6620 II

GO FIND YOU A 1984 6620, S_N OF ABOUT 600000. THESE ARE PRE-TITAN II AND HAVE All THE BUGS WORKED OUT AND SEEM TO BE MORE RElIABlE THAN THE 85-87 TITAN II MACHINES, ESP. IN THE FAN HOUSING AREA. IF YOU WANT TO HElP YOURSElF OUT, IF IN SOYBEANS, GET AN AIRFOIl CHAFFER. THIS GETS YOU ClOSE TO THE EXTRA SIX INCHES THE TITAN II'S HAVE ON lENGTH OF THE SCREENS. SOME MACHINES HAVE THE DUAl SPEED CYl., I THINK IT IS A WASTE OF $. DON'T lET THEM SEll YOU ON THIS. THE SPlIT IN SPEEDS ID AT THE WORST POSSIBlE PlACE, ESP. IF YOU MIGHT HAPPEN TO RUN A SPIKE TOOTH CYl. GOOD lUCK. P.S., DON'T BUY RED, AND MAKE SURE YOUR 6620 HAS THE BIG ENGINE, I.E., A RICE OR CORN MACHINE.

I have a 6600 and the main differences between it and the 6620 series is horsepower, cab comfort, controls, unloading auger and bin size. The guts between the two is pretty much interchangeable.