The service manager at a GM dealership told me that if the computer senses a problem
with the Allison transmission it will put the truck in to a limp mode or it will simply shut the transmission down and you will be sitting on the side of the road.
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DPAM
2017 GMC Denali diesel, crewcab, 4x4, regular box.
2010 Montana 3150RL- Moving to Montana Package , Hickory Edition Package, wet bolts
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