I doubt there is anything wrong with your truck, that just seems to be the way some cruise controls work. I had a V8 Durango that did the same thing, even though it had plenty of low-end power. Same thing with an inline 6 Grand Cherokee.
Previous to the H3 was a V6 Explorer, and it was much better, although it dropped speed instead of shifting down.
I think GM's calibrations are meant to try to maintain speed, and if shifting down is what it thinks is needed, that's what occurs. I haven't been to the Hill Country yet, but on some of the big overpasses in Houston mine does the same thing.
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2010 Red Rock Metallic H3. Just as cool as the first four Hummers I owned. Yeah, I have a problem.
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