If what they have said is to be believed, there aren't going to be any modifications required. I'm planning on getting one, so I guess we'll see how it works. I'm not going to spend $4,300 on the Passon box (which, by the way, isn't actually based on the 833, it just looks like the 833) to have a weaker transmission. The cars that are so valuable that you don't want to cut them up, are going to lose value if they don't have the original numbers matching 4-speed in them, so I don't see much point anyway.
