Hi Boogieman,I went to order a Tremor and my dealer tells me with the gas motor you can only 4.30 gears. You have to get the diesel to get 3.55 gears. The 4.30 sounds way to low for me.
Yup both Gas and Diesel have a single (read NO choice) option for gearing with the ratios as you stated. Having owned larger trucks with big tires the added rotational mass significantly reduces performance. To maintain a reasonable tow and payload rating, as well as customer satisfaction for acceleration, the ratios chosen are best suited. The mitigating factor here is the 10 spd transmission which allows for a broad spread of complete end to end ratios (crankshaft to wheel) which should help with towing and MPG concerns.
If it really bothers you remember you can simply swap in your gear of choice and re-program the ECU (Superchips, Bully Dog, etc) for speedometer compatibility.
Personally I am not buying my truck for mileage and will simply "suck it up" at the pump. Bigger concern for me is the question of when modding whether I am willing to handheld tune for a 5-10% power increase but then needing to step up to premium fuel.....
I came from a GM big block witch originally had the higher 3:73 gears, after running the lower 4:10s I am not a fan of the higher gears when towing or off road. Throw bigger tires into the mix and in my experience higher gears can produce worse economy than lower gears. Increasing tire size effective ratio goes up, couple that with the increased rotating mass and can really eat in to the overall performance when geared higher. I suspect that is why Ford only offers the lower gears on the Tremor.I went to order a Tremor and my dealer tells me with the gas motor you can only 4.30 gears. You have to get the diesel to get 3.55 gears. The 4.30 sounds way to low for me.
Living in a state with 80mph speed limit everything I have driven has taken a mileage hit at 80+ vs 75-. Yes you have to spin more RPM to hold that speed but wind drag is a huge factor is decreased economy as well. The forces seen by drag are puportional to the velocity squared, translation that extra 5 mph has a huge effect on drag and going to require more power to overcome it than just the RPM increase.I think your highway speed is going to factor into this. Here in Washington state I usually never go over 75. Other places I've lived, everyone drove 80 to 85. If I keep it under 75 my mileage is best. If you drive over 75 regularly with a 7.3 gasser and 4.30 gears, you're going to see your mileage take a hit.
I love the 7.3 and 4.30 gears with a 10 speed transmission. So much range and versatility.
That will give much worse mileage, worse braking, and worse throttle response. The engine computer will have to be reprogrammed to make it shift correctly. But it might wheel better in some situations, like sand. Taller gearing will not help this truck.Can always do a little rubber overdrive if you're looking to drop the RPM's and step up to 37's