CT7717 - A new speedo gear set for Turbo 350 Transmission. Correct speedo gears will allow your speedometer to read properly. It is a good idea to replace your speedo drive clip each time the gear is removed. A new speedo drive clip is included. Please contact us if you need help calculating the proper gear set for your TH350. Items included as shown: 10 Tooth Speedo Drive Gear, 18 Tooth Speedo Driven Gear, Drive Gear Retainer Clip