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A friend of mine just lifted his 98 Ram 1500 with a 3" ProComp lift. He also added 305/10/16 ProComp mudds on 16/10 Eagle 589 wheels. He wants to know if he can calibrate his MPH or how much he is off. Is there a gadget out there that can do this or someplace he can take it to be done?
Its a 98 Ram ext. cab 1500 with the 318.

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