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I had a F-450 I went back to the F350 dually because the 450 came with a 4:30 gear my 2019 F350 I ended up getting 355 gear and I'm pulling around 28000 lb no problem. I also only have the 6-speed transmission the 2020s have a 10-speed transmission it might be a little better with the 450 now I found I could only run around 60 miles an hour and the truck was comfortable at that the RPMs were around 2500 RPMs my 2019 runs right around 1900 RPMs at 68 mile an hour
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