I got an 03 GT and i just bought some new ford racing 3:73's and i'm wondering if i buy a programmer will it reflash my computer for my new gears. so i can put the dealer reflashing cost into a programmer. p.s and whats the best programmer

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yes a programmer can be used to recalibrate the speedo after getting gears.

 

does any programmer do it?

 

I know the Diablo, Superchips, and SCT flash tuners will.

 

Any handheld tuner should be able to do it
Diablo, Superchips, Hypertech, SCT, SLP