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Re: up-down,up-down,up-down shifting
In these trucks there is a low and high gear for overdrive. it is suppose to keep it from downshifting to third to help with MPG. so it sounds like a sensor like you said or something with the tranny.
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2000 Silverado Z71, 5.3L, K&N GenII Air Intake, Y-pipe Exhaust (no muffler), Bosch Platnium +4 plugs, 242k miles and still running.
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