Allison tranny shifting different now
I have a Chevy 2500 with 125,000 miles on it. Up until about 5K miles ago it always shifted into 6th gear when towing at 55mph. Suddenly it now shifts at 67 mph.
Dealer says no codes and that is the way it is! Allison dealer says it is info from the engine that says it isn't putting out enough power to shift at 55.
Sounds to me like some sensor or engine computer part that is sending the wrong info.
Any ideas out there?????????????
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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