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I agree that the transmission heat gauge is the most important for me. As far as the proper gear to run up and down hills goes, go down the hill in the same gear you go up. That's a safe way. Now that doesn't mean that because you're climbing the hill at 40 mph that you have to go down at the same speed. It just gives you a rule of thumb to go by. Your 7.3L Power Stroke will shift when it has to, but don't let it "lug." By that I mean, don't let it pull down so far that it almost stalls before it shifts. Most automatics will shift automatically, but you have to watch it so that you aren't shifting up and down, up and down, (in other words seeking). Manual shift units will tend to lug more than the automatics because we have a tendency to let them pull down to and RPM that is too slow. The 7.3L likes to run right around 2000 RPM. That seems to be its sweet spot. At least that's been my experience.
Orv
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