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Hi guys, I need to know how to figure out which speedo gear to install. I have a 26.5" tall tire with factory 3.08 gears and a TH350 tranny. The gear I have in is white but not sure how many teeth are on it. Today I had it on the Interstate with the speedo reading 85-90 and everyone was still passing me so I know it is off a ways just don't know which color gear/teeth# to get. Thanks for the help thus far.
 

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My Chevy II, with 308 gears, uses a driven gean with 18 teeth (didn't pay too much attention to the color). My tires are 26", so that should put you in the ballpark of 17-19 teeth.
 
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