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I can say for sure the 6.9 and 7.3 IDI are identical. I just did that change and everything off one worked on the other engine.
Since the same transmissions were in 7.3 IDI and powerstroke trucks I would think that the bell housing bolt holes will work. It is just everything else that is different. I never checked the motor mount locations.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.