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2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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Custom Tune Options
I was wondering if the more experienced could help answer a question....i have a custom tune on a sct and my speedometer is off..will it hurt to change the size and or the shift firmness or should i leave these alone?
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