![]() ![]() ![]() Drop driveshaft, unbolt tailhousing and remove, slide off old gear, replace with new gear (good. It is a TCI TH350 (Turbo 350) transmission. I think I understand how to get the old gear out and the new gear in, but have a few questions. Correct speedo gears will allow your speedometer to read properly. We have to replace the speedometer drive gear in the transmission to get our speedometer reading correctly. That distance divided by (pi, about 3.1416 in the absence of a dedicated pi key on your calculator) gives you the tire diameter, which form part of the error-correction equations we'll be using. CT7360 - A new speedo gear set for Chevrolet Turbo 350 Transmission. ![]() Measure the distance between the two pavement marks. Roll the car forward until the sidewall chalk mark is again at bottom center and mark the pavement. I think the Cast pwrgld may be a different gear than the aluminum version, th 350, etc. check for a 59/60/61 Chevy with a cast iron powerglide and 3.08s. Pioneer Speedometer Gear Adapter Seals - 760016-5. Will not work for automatic turbo 400 transmissions. 1 - 13 of 13 results for Transmission Speedometer Pinion Seal Compare Refine. Put chalk marks on the bottom center of the sidewall and on its pavement contact point. Exact fit for all automatic powerglide, turbo 350 and saginaw or muncie manual transmissions. You can decrease physical static measurement error using the "rolling circumference" method. Find many great new & used options and get the best deals for TH350 SPEEDO GEAR SET 8 & 20 Tooth Speedometer Drive & Driven Gears Turbo 350 at the best. That's less accurate than straight published revolutions/mile data because the tire diameter "grows" at speed or as it heats up it also "squats" at the bottom where it statically contacts the pavement. Failing that, physically measure (in inches) the tire diameter (the edge-to-edge distance across the entire tire face at its widest point as viewed from the side, not the tread width). It may be too much information, but the speedometer is calibrated to 1000rpm to 60 mph. Tire revs/mile: This data can usually be obtained from your tire manufacturer's website. ![]()
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