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Old 05-13-2008, 11:16 PM   #6 (permalink)
wildbill23c
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Join Date: Oct 2007
Location: ID
Posts: 338
The transmission logic shift control actually helps slow the vehicle on downhill descents, by automatically downshifting the tranny out of overdrive and into a lower gear in order to hold the truck back on steep grades. This works best in Tow/Haul mode. It works somewhat in normal operating range, and is activated by pressing on the brake pedal while descending a hill.
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