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As was said, the allison tranny is highly modified for 2006.
* A new ratio was added to get the sixth speed. (that means mechanical changes as well as software)
* It is beefier for increased torque rating of the new Duramax LBZ engine
* All new transmission control module
* New wire harness Connector
* New internal mode switch
* Revised Torque Converter solenoid
* New fluid pump design.
As BillE said, go to dieselplace.com. Also follow references from there to GM news releases for vast descriptions of what is changed.
Dave
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