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Just inducted myself into the Mustang life and want to get some action going!! So lets makes this an active thread :flag:

I'm always asking questions before I just take the time to figure it out myself... But I do appreciate all the replies!!! that was makes a good forum! Glad I joined

Yeah I corrected myself.. Idk where I pulled 4.11 from my bad

I'll tune for tire revs per mile. The 275/35-20 is 731 rev per mile. So we will see what that does. But I know the tires aren't making the engine run at high rpms and the car was built to race but we will see. I value your opinion so I will check

took it out on the highway today and at 70mph in 5th im at right around 2400 rpm so I'm gonna venture to say its gears and not the tires.. I've changed tire sizes on my truck before and it never changed the speed that much. But the way it drives points to gears... really short first gear and...

got it back from the dealer and they are idiots and said they had no idea what it was.. But i plugged the tuner in and tuned for 4.11 gears and the speedo is now correct. used a gps app and reset the trip and drove a mile and it was correct. the diff says 3.31, can you put 4.11 in the stock...

I'm assuming he flashed back stock and may have aftermarket gears?

I just bought a 2008 mustang gt and the previous owner lowered it, and tuned it and cold air intake and bigger wheels and tires.. 255/35/20 front and 275/35/20 rear. It came with a diablo predator programmer part number diablo-u7145. The speedometer is 5-10 mph fast and have no idea how to...