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Speedometer issues on 2002 roush stage 2

2K views 12 replies 3 participants last post by  ab_mach1 
#1 ·
The gears are stock from what i can tell, the car goes 70 at about 1.5k rpms but the whenever i enter the value on the sct tuner the speedometer is 8 to 10 mph slower than what im actually going any idea what is wrong?
 
#13 ·
The only thing I could think would be that maybe it has one of those speedometer recalibration tools connected to it. that is a module you can buy to set the speedo calibration for tire or gear size changes WITHOUT reprogramming (no tuner) your PCM. The module gets wired in speed sensor to change the output signal that is read by the PCM. It should be mounted by the speed sensor on the tranny, if it has one. I would assume all you would need to do is remove the module, but I'm not sure about that.
 
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