[Transformula]

The clutch and pilot bearing might be a challenge, also. The FS- series transmissions come with a 1.75" 10 spline input shaft. Another option would be to see if they make a smaller input shaft to swap into it. I build medium and heavy duty transmissions for a living. It will handle 650 ft-lbs. I believe this to be a very do-able swap, but finding the parts might be the hardest part. They do use a 4-bolt bellhousing pattern, similar to a 465, etc, but just bigger. For a 4x4, you will need a divorced- transfer case. I'd love to see what you come up with!