Is anyone running 35" tires with 4.10 gears. If so whats the RPM range in overdrive going 65 or 70 MPH. I have the 3.55 gears now and want to upgrade.

 

I am running 35'' tires with 410 gears. At 70 mph I think I am turning 1900 to 2000 rpm.

Tim

 

Thats the RPM range I want to be at. Thank you Tim

 

If it was me i would go with 4.56s.. while you will be turning a few more rpms on the highway, it would easily be worth it for the power increase.

 

I drive 45 mins to work and back and i typically drive 75 to 80 MPH and I dont really use my overdrive because when i do use it i end up pushing the pedal a little further to keep my speed up. So now my question is would 4.56's be screaming at 75 to 80 MPH ? 2300 RPM's would be ok for me but any more then that would be more then I want at 75 to 80 MPH with overdrive on

 

save the 1500 bucks and buy a beater work car. i think that would be better.

but seriously, i think 4.56's would put you about 2200-2300 at 70mph

if you never plan to tow anything really heavy or upgrade to bigger tires, like 38's then 4.10's will work for you.

4.10's put you near the stock rpm's

 

I looked it up in a gear ratio calculator and at 75mph you turn a little over 1800rpms now.. and with the 4.56s you would be turning a little over 2300rpms.

Which i would be fine with 2300 rpms.. if you had a stock f-150 with the 3.73 ratio with the 255/70r16 that some came on some of them you would also be turning 2300rpms.

 

^^^^do you have a website for the gear calculator???

 

Gear Calculator

 

thanks for the link!

 

Sorry to ask another question, but i was also considering getting the 4.56s. I currently have 35s and the stock 3.73 gears out back. My buddy told me that id get better fuel mileage going to the 4.56s. is this true? because wont the rpms be higher and so youd be using more gas or am i mistaken somehow?

 

i dont think RPM's matter. what matters is how far you push the pedal down. with the 4.56's you could accelerate a little faster with less peadal, you'll save gas with lower gears in city driving

 

Yeah the main reason you "could" get better mileage is because it is MUCH easier to get the truck moving.

 

ok sweet thanks guys sorry i your thread!