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Correct your speedometer when changing gears with a Ford Racing Speed-Dial Speedometer Adjuster, part # M-4209ADPT-A.
Posted by Unknown on 24th Sep 2011
I HAVE A 09 GT MUSTANG COUPE, 5 SPEED MANUAL 4.6L, 300 HP OEM. I STARTED TO ADD HP GAGETS TO INCREASE POWER AND IMPROVE PERFORMENCE. NOT MUCH IMPROVEMENT. THEN THOUGHT ABOUT THE REAR GEAR. I DID SOME RESEARCH AND LEARNED THAT THE GEAR IN MY STANG WAS ONLY 3:31. NO WONDER I WASN'T GOING ANY WHERE. ORDERED A SET IF FORD RACING 4:10 GEARS. HAD THEM INSTALLED BY FORD AND, ALL I CAN SAY, IS WOW. A WHOLE NEW CAR. COMES OFF THE LINE LIKE A MUSTANG SHOULD. FORGET THE HP GAGETS, AND CHANGE THAT GEAR. ALSO, LITTLE OR NO CHANGE IN MPG.