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Found some information. From what I read he uses a TC from River City Diesel on the Towmaster tranny. And Precision Industries for the upper scale models.
I was under the impression that John uses Suncoast TC's now for the towmaster at least... not sure who he is using for anything else, but I think Suncoast's go in all of them. Could be wrong, but mine has a Suncoast!
He was using a shop to build them for him, with specific parts and some made by him. He switched to Suncoast because of production delays. I know my buddy has a towmaster with the other tc in it, his is louder and "rattley" (like some say a billet converter will always be) mine sounds smooth as butter!
Don't take my word for it on any of this, just what I have heard from some pretty reliable sources. One easy way to find out...Call John, he is always happy to discuss things with customers