I ran 5 635D last year I will never put myself through that again someone else can do the RandD for Deere I cant afford it. I ran 635 F in beans, the cost of the FD70 is a lot less than the two Deere headers. I put 400 to 500 hrs on in wheat and 100 hrs in beans, so a draper is a must. I just needed to know if a 9770 will handle the 40, hdr, weight, capacity, stability, residue, flexing action in beans. the beans I do are resonably flat but a lot of times muddy, wheat varies from 30bu to 60bu. Just looking for opinions of people that ran 40's on there deeres