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What is the maxiumum 4hi speed? I know you are supposed to engage it under 55, but is it rough on the drivetrain if you take it above 55 with 4hi engaged?
I ran 77 in the snow once, just to see what it would do. (it was light snow and there was no one on GA400 and thats a big wide azz open expanse of road)
only use 4hi where traction is limited. or your t-case will pay the price. personally i dont use 4hi on the highway unless its to bad to be goin over 60mph anyways.