Product Information
- For use on 1979-1998 Mustangs with a T5 transmission
- Helps correct the speedometer gauge
- Works properly on rear end gears at 3.73 or higher (3.91, 4.10 and up)
- Does not work on other transmission types
- Will not fix speedometer on 3.55 gears or lower (3.31, 3.21 and down)