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Increasing the rear gear ratio in your 2005-10 Mustang will significantly improve acceleration. 2005-10 Mustang rear ring and pinion rear gear sets are available in many ratios, including 3.55, 3.73, 3.90, 4.10, 4.30 and 4.56. Depending on your car’s setup and your driving style, Brothers Performance has the 2005-10 Mustang ring and pinion gear sets from Motive Gear, Richmond Gear and Ford Racing to suit your requirements. To prevent whine and vibration, buy a quality brand name and make sure to install it professionally with a new gear installation kit.