Duramax Diesel and Allison Transmission help
I have an 05 Duramax 6.6L with the Allison 5 speed automatic. It is the next generation LLY motor. Lately on longer trips the tachometer needle "bleeds down" and ends up below zero RPM. The towing setting seems to work with the downshift "kickdown" when I pump the brakes. Does anyone know if there is a sensor or pickup that might need to be cleaned? Does the reading come from the transmission or engine? Thanks for any help on this one.
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