Interesting that the brochure mentions a heavy-duty 5-speed manual in at least three places, specifically referencing a creeper 5.72 first gear and calling it an M5OD-HD - sure sounds like a ZF! The chart on page 13 showed it only being offered with the 300 motor, though. I'd always read that they never offered a ZF in a Bronco, so I wonder if any ever left the factory that way or if the marketing guys just fubared that.