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Ron and Terrie, I have a question for you. I know both the Allison and the Ford TorqueShift automatics have the tow/haul mode with the automatic downshifting. There's been some comments on this terrific feature in some of the magazine tests. But my question - I know the Ford 6.0 diesel has a variable vane geometry that tow/haul and the engine computer use to create a backpressure similar to an exhaust brake when slowing down. I recently read that the Duramax also has variable vane geometry in its turbo, too. I got the impression that this is new with the Duramax upgrade. My questions - is this used in braking like the Ford, and, is this new for Duramax with the latest upgrade or has that been part of the Duramax all along. I've not heard of the Duramax having this until recently so am just wondering why it wasn't touted before. Or maybe I just missed it.
Thanks.
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