ididieseler
Registered User
I'm currently running 3.50 gears with 35 12.5 15 tires, i want to get a little more power, i dont really want to keep having to downshift for hills as much as i do. how much hp would i gain if i swapped in 4.10 gears? also, how much would my gas mileage suffer, the truck is a 1978 f150, i have a 7.3 with a banks sidewinder turbo and a zf5 speed trans, 3.50 gears and 35 inch tires, im currently getting about 16 running winter blend fuel, in minnesota so its subzero about half the time right now lol. how much gas mileage might i lose going to lower gears?