02 mustang gt speedo help

[steven21]

I put 4.10 gears in my mustang gt an I bought a predator tuner from my friend need help with fixing my mph says in the manual for 4.10 it should be 4.1 but I don't see it on the tuner

[bigkeeko]

4.10s were installed in my 2003GT. On my tuner my setting was 4.09 .Thats the right setting and my car runs perfect. Bear in mind if you`ve changed the tyre/wheel diameter then you`ll have to adjust your speedo using the `modifying parameters` part of the tune. If ou haven`t changed wheel/tyre size then no ned to do anything.

Formula for working it out;

Tyre Size Tyre revs per mile = To properly calculate the revs per mile you will have to measure your rim and tyres diameter (in inches) and put it into this formula :20168 divided by tyre diameter = revs per mile Ex. 20168 / 26 = 775

[steven21]

Ok I got it thanks man

[steven21]

Ok I got it thanks man