I don't think the parts are interchangeable because the R11 is stronger. The T85s are bullet proof. And with an R11 might be worth building an adapter. A three speed with an OD is fun to drive. I don't know if a 4 speed is worth it other than the obvious final drive ratio. Watch for the Studebaker T85s. They look like a Ford but the input shaft bushing area is bigger and longer. Sill good and the Stude guys love them. If you come across just the OD remember you nee the main shaft from the trans to make it work.
