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Increasing the rear gear ratio in your 1986-93 Mustang will significantly improve acceleration. 1986-93 Mustang 8.8" 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 fox body 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.