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My 2004 Mustang GT originally had a 3:27 gear, but previous owner installed a 3:73 gear setup! Using the speedo readings without flashing computer what is the odometer mileage doing, adding mileage or subtracting!? I previously installed the Ford re-callibration box, it changed the speedo to...

My interior courtesy lites do not come on when opening door! The dome lite works when I push each switch! I checked fuse and it was ok! I do not even see any bulbs under dash???

My 2004 mustang gt had a 3:73 diff gear installed which changes the speedo reading! My gt is an automatic 4 speed w/OD! Bought a Ford speedo recal unit and installed just as the Ford instructions stated! GREAT, NOT REALLY!!! Speedo was corrected perfectly BUT, now the torque converter...