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Allison 5sp: trans goes into safety mode/drops to 3rd gear.
I had a chip put in. Truck performs relatively well. 300k miles. Accellerate to pass, get to about 70 or 75 mph accelerating and trans kicks to 3rd. Sometimes have to shut truck off and let sit for awhile to get trans to reset. Is this just high mileage. fluids are new.:confused:- fguerrina
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- Forum: Mike L's Trans Talk