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Re: 450/6.4 owner help please!!
Mine started at 9 and is running at just over 10 now. I'm waiting for 1000 miles before pulling a trailer but with 4.88, which I have, the mileage between 60 and 70 MPH makes a big difference. I will be adding an overdrive unit to my truck for those times when I'm not pulling a heavy trailer. I'd go for the 4.30's if I weren't expecting to pull 24k in mountainous regions.
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