Turbo 350 transmission speedometer gear manual#
Smaller Chevy TH350 driven gears (left) interchange with many GM manual trannys. TH350 SPEEDO DRIVE GEAR 7 TOOTH TEETH Turbo 350 Speedometer Pink. See all 19 photos 19 photos A TH350-BOP/700-R4/TH400 uses the same large driven gears (right). The speedo driven gear is easy to change out, so it is always nice to have some options available to keep your speedometer accurate when changing out tires or rear end. Cost is something less than 100 and you end up with a laminated spedometer calibration certificate. 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. A full set (6) of new speedo driven gears for the GM TH350 Transmission, 17-22 tooth. 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. Measure the distance between the two pavement marks. The transmission wont change gears (Stuck in 2nd or 3rd) Very slow response. Roll the car forward until the sidewall chalk mark is again at bottom center and mark the pavement. 0-liter turbo four that puts out 255 horsepower and 295 lb-ft of torque. Put chalk marks on the bottom center of the sidewall and on its pavement contact point.
You can decrease physical static measurement error using the "rolling circumference" method. 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). Tire revs/mile: This data can usually be obtained from your tire manufacturer's website.
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