When you press down on the clutch and shift the gear selector, you move in sync with your vehicle and control how it stops, turns, and accelerates. Only a driver who has mastered the stick shift knows how important 6 speed manual transmissions are. The sixth gear on a manual vehicle is reserved for overdrive, also known as your fuel saving gear. So when your Chevy 6 speed manual transmission no longer allows you to smoothly shift gears, you know it is time to browse the vast inventory on eBay for a new one. Only a 6 speed manual transmission from Chevy can give your car the fuel preserving acceleration benefits that you have grown used to. For Mustang owners, the Ford 6 speed manual transmission is a thing of beauty. Built by the Ford Racing division of Ford Motors, these transmissions perform well under stress for extended lengths of time. When it comes time to replace your old transmission, a 6 speed manual transmission can give you the car ride you are looking for.