Appreciate the input. Like you I am not sure about any of the lock up converters living in an RV. I have emails in to several places and will see what they have to say. As far as the fabbing goes, I put a 518 behind the 340 in my Challenger in 1994. Truck chassis would be a piece of cake. Fab a mount and cut the driveshaft and it is done save for bolt ons and a couple wires. I think I have talked myself into pulling my 518 non lockup core down to see what it needs for this build. If I want still lower rpms I can run my gear vendor unit being the 518 and have double overdrive at about .54 to 1.