FORD MUSTANG 1999-2004 SPEEDOMETER RECALIBRATION TOOL PROBLEMS

BILL JACOBS

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Sep 17, 2017
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My 2004 mustang gt had a 3:73 diff gear installed which changes the speedo reading! My gt is an automatic 4 speed w/OD! Bought a Ford speedo recal unit and installed just as the Ford instructions stated! GREAT, NOT REALLY!!! Speedo was corrected perfectly BUT, now the torque converter shifts up and down iradically , was perfect before!! Consulted Ford dealer and was told there is no adjustment for this!!?? I just disconnected and shifts fine, of course speedo is off as before!! Any Ideas?? THANX!!
 

Sluggie24

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Jan 12, 2017
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Might be better off getting a hand held tuner (SCT or Bama) and having the speedo corrected with a tune. Will get more HP and better shifts with the tune as well as correct speedo readings.

Btw the converter doesn't shift, it just locks or unlocks, the PCM shifts the trans based off of vehicle speed sensor signal and throttle input.
 

BILL JACOBS

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Sep 17, 2017
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Thanx for the info Sluggie24, I will check out the SCT or Bama, Don't know what they are , but will find out! Thanx again Bill J
 

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