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Awhile back I had to pull our Montana up onto a stack of leveling blocks, three blocks high. They were "stepped" so not damaging to the tires but a long ways up nonetheless. I put the Dodge in 4x4 Low Range and let it just idle the Montana up onto the blocks. Our neighbor came over later and started asking about the Dodge and whether it is chipped, etc. He mentioned how impressed he was the Cummins pulled all that weight up onto those blocks with the engine just idling. Since he was driving a competing brand I didn't tell him the low range is what does that. I've done the same thing with the Ford 4x4's we've had in the past and I'm sure GM would do the same in low range. I figure using low range makes it easier on the torque converter and maybe the engine and transmission, too.
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