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Yes my dually has 17's but I also have tires that are 2 sizes bigger then stock. It does change the drive ratio. If I remember I looked it up cause my 3.73 rear was not acting like my old one but I found somewhere that my tire size changed it to like 3.60's. Not a big change but I think it was enough to mess with where I should be rpm wise in high gear....But either way there's lots of 2014 Fords out there towing lots of different trailers so there has to be a way to set it up. I don't think Ford would make a truck that could not tow a 5er. Oh wait a minute, lets just hope the same engineers that designed our Montana's didn't work for Ford...lol lol lol
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