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Power Strokes
Aftermarket Super Duty 1999 - Current
3.55's or 3.31's???
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[QUOTE="Jeff@Spartan, post: 85425, member: 223"] If I am running 80 right now, I am at 2200-2250 RPM's. 75-80 MPH (usually 80 MPH) is my average speed on the highway. I am currently running 305/55/20 Toyo AT's, which don't help. They measure 32" on my wheels and are really, really heavy tires. The plan is to do 22" wheels and 305/45/22 Nitto 420's. If I were to keep my 3.73 gears and run those wheels and tires, my RPM's would be like 2300-2350 at 80 MPH, which would make my fuel mileage even worse. I believe the 3.31 gears to be appropriate for the direction I am headed. I have a few other things up my sleeve to improve fuel mileage, so we shall see. I think efficiency is key, and the mods I will do should really improve the efficiency of my motor. [/QUOTE]
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Power Strokes
Aftermarket Super Duty 1999 - Current
3.55's or 3.31's???
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