6 Tooth Speedo Drive Gear 4Spd Pink 65/73 1964-73 Ford Mustang (4/speed M/T, with 3.50 to 4.30 rear axle gear ratio) 1979-79 Ford Mustang (2.3L Turbo, 4/speed M/T) 1967-1973 Mercury Cougar (4/speed M/T, with 3.50 to 4.30 rear axle gear ratio)