I have thought about a 4bt, and it would be a lot easier to swap and probably not hard to find either. But in my mind I figured if I'm going to do all this work I might as well go with the 5.9, especially since I already have one. I've heard that the 3.9 also vibrates a lot but I've never been in a vehicle powered by one so I can't say for sure. With how I plan on swapping parts I could very easily put in the 4bt and later put in the 6bt. Still have a lot of time before I do anything so there are a lot of options I will consider. After all that's the whole reason I got back on here, to get some great ideas from you guys!
