Can anybody fill me in? I have a case 220 Hy-Drive which I'm building an articulating tractor from. Of course I need another one to complete the project. My question is, what other models would the transaxles be the same. I have found one for the right price and the guy told me it's in perfect running cond, However he says it has the big wheels. I didn't know the 220 came with that option. As long as the gearing is the same I don't care about the wheel size. Can anyone help me with this?