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Gear swap in a 00 F350 Dually
My dad just bought a 00 F350 7.3 6sp 4x4 dually truck to haul freight with. I think he will be pulling the 37' gooseneck flatbed that weights about 6500-7k dry. On that, we will be loading anything from 1k-13k worth of freight. The truck currently has 63,000 miles and bone stock.
We are ordering a PHP Phoenix 6 position with stock, 25 heavy tow, 40 tow, 65 tow, 80 daily driver, and high idle settings. Truck will have boost and pyro on it when chip goes on.
My question is this: The truck currently has 4:10 gears in it, and we are concerned about fuel mileage (as all LTL hot shotters are). I was thinking about swapping 3:73's in, and was looking from advice from guys that were running both gears.
Also, has anyone out there done this swap? I have a buddy that has set up a few in mustangs, camaro's, and his own 67 chevelle. He has all the proper gauges to measure backlash, and none of his cars have ever whined when set up. Are the Super Duties anything magical to install? Does the 4x4 equipment get in the way (ie, do you have to pull the hubs and junk to pull the axles to remove the R&P, or can you just slide them out enough without removal.)
Any other fuel mileage tips beyond the better exhaust, better intake, chip discussion would be greatly appreciated. I have only owned cummins till now, and am new to powerstrokes.
Thanks in advance!!