A relatively light weight camper and a flatbed lives on my '21 7.3 Tremor, so I always keep it T/H. What other have said about shifting pretty well covers it. On mine, it keeps it geared down in low enough gears on steep descents, which is nice, but then when the road starts to flatten out, or the grade decreases, it doesn't shift back up into higher gears, which is annoying as hell. So usually, I have to shift into M and manually upshift, until the RPM's are where they should be. That issue may have been resolved in later models.
