Ford Racing Speedometer Recalibration Tool
Ford Racing Mustang Speedometer Recalibration Tool M-4209ADPT-AC (94-10 All) - Free Shipping
This. I have an axle with 4.10s lying around, but since I'm not interested in modding my car further after this i'm not willing to drop the $400 on a tuner.
Who has this on their automatic? Even though the Ford Racing website says it can be used on autos, the AM reviews say otherwise. I'm gonna make sure to take it to a shop but the reviews are scary lol
"Joey" 2004 v6: SR CAI, MPT Tuned, 4.10 gears