So I bought some axles with 4.10 gears that I will be putting in Duchess, my 86 F250, which is technically gonna be an F350 after the dually axles swap.
Truck originally came with 3.55 gears, with slightly undersized tires I was at 2350 at 80 mph.
I run Interstate highways frequently enough, and usually about 5-6 over on highways of any kind, unless it’s really busy or lots of houses…
I’m wanting to go to slightly oversized tires after this swap, but might not immediately, especially since the fronts are new and the rears are 70% tread, and Hankook AT2s are expensive... Calculated 2700 RPM at 80 MPH, with current tire size, and 2450 with 235/85 R16s at 80.
I run 2700ish in 4th at 65 with a trailer, with current gears and tires.
These old engines seem really tough, but would 3 grand literally all day long take life off my engine? These engines don’t seem very well balanced.. it runs good at high rpm but just want to make sure this ain’t shortening her lifespan.
My dad seems to think that I’d gain a lot of power, and lose a lot of life, with lower gearing, not so sure if I agree with him… but I guess the faster it spins, you’d gain some heat and thus some wear… he seemed to think I’d be best off with 3.73s, which does sound optimal, not sure what a gear swap entails…
Truck originally came with 3.55 gears, with slightly undersized tires I was at 2350 at 80 mph.
I run Interstate highways frequently enough, and usually about 5-6 over on highways of any kind, unless it’s really busy or lots of houses…
I’m wanting to go to slightly oversized tires after this swap, but might not immediately, especially since the fronts are new and the rears are 70% tread, and Hankook AT2s are expensive... Calculated 2700 RPM at 80 MPH, with current tire size, and 2450 with 235/85 R16s at 80.
I run 2700ish in 4th at 65 with a trailer, with current gears and tires.
These old engines seem really tough, but would 3 grand literally all day long take life off my engine? These engines don’t seem very well balanced.. it runs good at high rpm but just want to make sure this ain’t shortening her lifespan.
My dad seems to think that I’d gain a lot of power, and lose a lot of life, with lower gearing, not so sure if I agree with him… but I guess the faster it spins, you’d gain some heat and thus some wear… he seemed to think I’d be best off with 3.73s, which does sound optimal, not sure what a gear swap entails…