If you live in the Dallas area and need to calibrate your speedometer due to a change in wheels/tires you may want to contact these people.
ZEPCO
508 N. Central Expressway
Richardson, TX
1-972-690-1052

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97 F150
sc, flairside
"SHOWTRUCKS USA" conversion package
2.5" dual exhaust
Flowmasters
K&N filter
Superchip