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Increasing the rear gear ratio in your Mustang will significantly improve acceleration. Mustang rear ring and pinion 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 Mustang ring and pinion gear set 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.