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I can't help you with the bumper bracket, but I too am interested in what Marmon did with the T-case & park brake. I'm doing a 4x4 conversion on a 94 F-Superduty...
the axle is a mc 80 made by carraro the transfercase is a borg warner 4470 with a custom adapter and cross member between the tranmission and transfercas with the stock e brake on the back of the transfercase