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Even if youre undecided about modified versus stock, efficient overdrive can be yours for keeps, or just for now. Windsor-Fox Performance Engineering has a complete, five-speed conversion kit for Mustangs with a stick. For those craving slushbox clutchery, Fords automatic overdrive is easily installed with conversion kits and parts from Windsor-Fox. Best of all, these are bolt-in items you can remove if the desire for stock overwhelms you in the future.