![]() Trust me, I've done hundreds of speedometer gears with this method and ALL OF THEM came out perfectly fine. Fits in the side of the transmission to drive the speedometer cable Green with 22 teeth. ALL of those gears when the driven gear is divided by he drive gear have a resultant of close to 2.8666 so all of them will work. Three Speed Transmission Speedometer Driven Gear for a 55-57 Chevy. Now look at the chart and find the numbers in the chart that are close to 2.8666. The calculator said you needed a 15 & 43 gear but what you needed to deduce from that is that you need a PAIR of gears that will give you a drive ratio of 2.8666. Drop driveshaft, unbolt tailhousing and remove, slide off old gear, replace with new gear (good. Please contact us if you need help calculating the proper gear set for your TH350. It is a good idea to replace your speedo drive clip each time the gear is removed. Correct speedo gears will allow your speedometer to read properly. It is a TCI TH350 (Turbo 350) transmission. A new speedo gear set for Chevrolet Turbo 350 Transmission. I think I understand how to get the old gear out and the new gear in, but have a few questions. Here's where you are confused and don't feel alone because most people are confused by the process of getting the transmission drive and driven gears. We have to replace the speedometer drive gear in the transmission to get our speedometer reading correctly. ![]() Cost is something less than 100 and you end up with a laminated spedometer calibration certificate. From a post where the member was CONFUSED with the chart and how to use it.Ĭalc says 15,43. I fix these problems by going down to my local speedometer shop and having them put in an auxiliary gear box that precisely corrects the difference. TH350 Master Speedometer Gear Kit 7 8 9 10 Drive & 18 19 20 21 22 Driven Fast and reliable.
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