New gear in, what about speedo?

[o2superstang]

Just put 4.10's in my 00 stang. What do i have to do to make the speedometer read right?

[COBRAon18s]

same situation in my 99, speedo is way off, i ordered a speedcal, which seems like the way to go with the 99+mustangs. When it comes in, ill let you know how it works, you can get it for 80 bucks from brothers performance or from dallas mustang for 100. Hope this helps.