I had researched converting my 1980 BJ40 from a B to a 13BT and it is pretty much a straight swap bolt up deal with the exception of the change in drive shaft lengths. Today, while looking into a related subject, I ran across an old thread which began to compare (but never finished comparing) the 13BT to the 14B and the 15B. Maybe they lost interest in the project. http://forum.ih8mud.com/diesel-tech-...-vs-13b-2.html I had pretty much decided to go with the 13BT previously when I read the thread today and realized that I hadn't considered the the 14 B or the 15B. From what I have been able to learn the 14B sounds like a beautiful beast which if turbo'd would be a dream. Will the 14B or the 15B drop in my engine bay the same as a 13B, same engine mounts? Will the 14 or 15B bolt onto either the H41 (current) or H55 (ordering) trannys? The 15 BT came with the Mega cruiser, really not much out there on the 15 BT, probably because not many Megas made. This makes me think that there will be big engine and then parts availability problems. Anyone have any experience with the 15 BT? It seems that Hino made these engines and placed them in Coaster buses and forklifts and the like, (not sure), as well as Cruisers which if true would make sourcing parts easy, right? I have searched Mud 8 ways to Sunday and can't get much on the 14 or 15 B or BT. Googling didn't help much either just random references in Aussie forums but nothing concrete. Cruiser FAQ was fine for specs but I was hoping to flesh this out more. As of right now I'm just doing regular maintainance on the B engine until I can source it's replacement. So this is of interest to me, hopefully others too. Thanks for your thoughts.