Re: recalibrating speedometer on a new GT
Depends on the overall height of the tire. Are the 20" a bigger overall diameter? There is a certain amount of N/V that the computer will learn. Your other option if the dealer won't do it is to get a handheld tuner like the SCT Xcal2 and adjust it via the tune.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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