Discuss how to fix the speedo after 4.10's? on AllFordMustangs.com, the place for Mustang enthusiasts.
Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.
You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.
I have a 2002 GT and I put 4.10 gears in and of course as expected the speedo was off. Is the only way getting it fixed a SCT handheld tuner? and I already have a tune on the car and if I was to use the sct tuner would that effect my tune I already have?
2002 MUSTANG GT 4.10 GEARS,K&N CAI,DYNO TUNED BY PRO CHARGER,FLOWMASTER 40'S EXHAUST 70,000 MILES
You should be able to just change the axle ratio in your tune without affecting the rest of the tune. I don't know about the SCT, but on my Diablosport Trinity I can modify my custom tunes and change the gear ratio.
I'm not personally familiar with SCT, but assuming that it's menu operates similar to Diablo you would just go to a menu option like Modify Parameters which will then bring up a list of things such as axle ratio where you can make changes as appropriate. Read through the owners manual on the device (download one from the manufacturer site if it's missing), it should walk you through this. If you can't figure it out and you originally bought the AM/Bama tuner deal then just contact them and they can get you set up.
2001 GT Convertible
All the usual bolt-ons 1967 Coupe
200 I6, C4
If you have a tuner you have what you need to recalibrate for the gears and do not want to try to use a second tuner to do so. Should be as simple as reinstalling the same tune and adjusting end user parameters. Make sure you only adjust the gear ratio, playing with fuel and spark trims can make things go boom, more so with a supercharger.