Assuming that's the 70" tiller? I have a 60" King Kutter on my 4410 and depending how deep and wet it is, sucks up a lot of power. I would stay with a 60". Tilling is a slow process anyways and I prefer not to overload the tractor. I think my 4410 would handle a 70" but I don't use it more than a few hours a year, so don't need the extra width.