Whiteline Positive Shift Kit | 2011-2018 Ford Mustang (KDT928)Whiteline Gearbox Mount Bushing KDT928 Bang For Your Buck! Whiteline's Positive Shift Kit inserts into the factory gearbox mount and results in a greatly improved shift feel and response by reducing the compliance of the heavily voided factory mount. Features Our engineered "Synthetic Elastomer" bushings feature the quality ride of rubber at lower speeds and at higher speeds react when under cornering, accelerating and braking loads, for CHASSIS