4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Speedo Problem

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Old Jun 8, 2010 | 04:12 PM
  #1  
MustangLouver's Avatar
MustangLouver
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Joined: Dec 2008
Posts: 915
From: North Carolina
Default Speedo Problem

My speedometer is off by about 10%. What all is needed to fix this? Would it throw my mileage off?
Old Jun 9, 2010 | 01:08 PM
  #2  
WhiteFoxGT's Avatar
WhiteFoxGT
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From: Delaware
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Im assuming you have stock gears. Did you put a larger diameter tire on the car? Idk if handhelds can compensate for tire size. I know the ford IDS can on newer vehicles.
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