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Charlie having a 9 speed sounds perfect for the Cummings. I know that the new Ford with 10 speed is a monster for power and economy and GM’s new 10 speed also helps their rig. On TFL.com they test a lot of rigs on the IKE Challenge and having extra gears when towing 30 K Made a huge impact. Is yours a standard transmission? I can’t remember but I thought the Road Ranger was an improvement over the old main gear box and a browning secondary gear box.
Happy roads to you.
Tom Marty
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