lOl - NH head at 8 mph. That's funny. When I was working for a New Holland dealer, we could never get our TR98s and TR99s to run that fast in wheat, because the header couldn't cut it fast enough. I went to the TR Basic and Advanced service schools, and the engineers TOlD us that they were speed-limited by the header, and not machine capacity. They were even (and maybe still are) experimenting with some kind of a endless sickle set-up, with the sections mounted on a belt or chain. I was at a school for the 60-series Deere the other day, and they told us the same thing. Until the 600 head came out, the STS was speed-limited by the header. I've seen the new 635F run in the field on a 9860, and it's a cutting SOB, thanks to a true inline knife drive, rather than the old wobble box. The sections and guards are also very different. It also cuts up to an inch lower than a 900F, thanks to the hydraulic flex system. I've also never seen ANY combine travel through the field at 8 mph with ANY kind of platform or flex-head on it. Corn heads yes, but not a reel head. Maybe you'd better recalibrate your ground speed display.