I know anything is possible, but is the tranny out of my 54 6400 chassis possibly a gkt-134 and not an sm420? It has the foot starter bellhousing. It was mounted behind a 261. Edit: strike that. Reverse... I ran the numbers 591953 and it's an sm420. So... That means I have the correct bellhousing and clutch already. Length is another matter, but shortening a two piece driveshaft isn't a game changer. That leaves the PTO.