This Mustang Speed Cal is a highly flexible, easily adjustable electronic speedometer recalibrator. With the SpeedCal, you can maintain accurate speedometer readings with virtually any combination of rear tire size and gear ratio.
The Mustang Speed Calibrator or SpeedCal is used to correct electronic speedometers in 1996-04 Mustangs due to wheel and tire changes as well as rear gear ratio swaps.
The SpeedCal is capable of speedometer adjustments in increments of 0.2% and will provide accurate vehicle speed data above the displayed speedometer value (160mph for a late model Mustang Cobra). In order to retain this accuracy care should be taken in determining the correct binary code as the SpeedCal cannot provide accurate speedometer readouts with an incorrect ration multiplier selection.
Includes all necessary hardware and installation instructions!
Fits 5-Speed cars only. Also works for 96-98 cars when a T45 or 3650 with electronic speedometer has been swapped in the vehicle.
I changed the rear gears in my 98 svt cobra and the speedometer was way off. A 23 tooth speedometer gear will get you close but will self destruct in your transmission. This calibrator in conjunction with a 21 tooth speedometer gear got me right where i needed to be. Mike provided me with excellent customer service from latemodelrestoration.com and I am more than pleased with my purchase.