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If you read the owners man, while in tow-haul mode, the 6.7l never hint overdrive. 5th and 6 gear are split by the new tranny. You can leave it in 6 but it will never go into overdrive. which is good for towing that heavy load.

Good job "txbobcat", I wish that everyone that buys a diesel truck understands how a DIESEL works. Low RPM while in tow, get ready for dealership.... 5.9l or 6.7l CTD can run all day and night at 2500. My first truck over 300,000 most under tow.

6.7L Factory engine brake, tow-haul mode, cant beat it.. Truck will slow itself to a crawl. "air in-air out" .

Great Truck, throw a chip, intake, exhaust, that 6.7L with 500hp will run up any hill with 18000LB trailer behind, GM Ford, ill wait for you on the top. Airborne

Stop with the truck debate. Their is only one truck out there and it has a straight six, haven't had to change engines with every model year.... Buy what you like.... Airborne....

Fader works on my unit , front, rear... I had some trouble for about the first Year...LOL