Eaton-Fuller Transmissions

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Does anyone have any experience with the Eaton Fuller FSO-6406A or similar? I am going to be running a 454 in my build, and I saw on a medium duty truck salvage yard a couple of different Eaton Fullers that were coupled to a 454. I called the salvage yard, and of course I could not get any compatibility information. I have sent EF a couple emails in the last 2 months and no reply. I want a very strong OD gear for towing, and maybe these are tough enough. Anyone know anything about what Eaton Fullers will fit a 454? Another question is what transfer case will fit this combination? I have a passenger side drop.