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I have an 07 crown victoria p71 and I'm in the process of changing gear ratio from 3.27 to 3.73 I have stock tires 235/55/18 and wondering is there a scan tool that I can use to recalibrate my speedometer is so please advise what else I need to do as well .
u can use hptuners by vcm suite
some cars dont need credits and you can change gear or tire ratio by vcm scanner like dodge
but crown vic's need a tune by vcm suite which need credits
stock tires is 235/55/17 or 225/60/17 not 18"
u can change gear ratio very easy dont worry but needs a tune