Hi JDSeller. My ground is not flat. But have farmed it with level land combines for years. Always have to keep speed down in heavy corn on a hill. This particular 6620 Titan II has about 5000 hours, but a pickup load (honestly) of parts were added 700 hours ago. Elevator chains, cylinder bars, etc., etc. Owner figures all of the wear parts are still 50% to the good. I can buy it for $6000. What goes in the final drives????? Someone told me that tearing them down every few years to check the bearings, etc. is good rather than waiting for them to break down. Could you give me a call. 319 330 3802. Thanks.