I don't know a thing about the IVT transmission. I assume it's like a hydrostatic drive on a lawn tractor like my old 318 JD had. Will it have any warranty? That is a nice size and it was made in the USA, 6 cylinder with a closed hydraulic system. Low hours for an '04. Was it a mowing tractor? I'm coming to the conclusion that closed is preferable to open. What about that 7510? How is it doing for you?