new Ford 7.3 gas with 3.55 axle ratio, does it work?

You guys going on about high RPM's, that is the truck running at max overload in the ROCKIES. Worst case scenario. That IS diesel territory but this is showing if NEEDED the 7.3 can do it as well, just not as pretty.

With a TC on the back unless it is some behemoth overloaded TC you won't be running those RPM's.

So carry on, yes diesel is better in SOME situations and we know that.