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I have a 1986 el camino with 3:73 and a turbo 350 trans and i need to find a speedometer gear for that. I looked around and they had different numbers of teeth and im not sure what one i need. Im tired of using my speedometer app for my phone lol
 

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what is the size on your rear tires i have a few gm speedo gear charts and can look them up but i need the rear tire size
 

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the gears i get from the chart is a 15 tooth gray drive and a 45 tooth lt blu driven.this is for a 26.1 in tire and your is 27. so you may need to go with the 43 tooth gear to get exact. each tooth on the drive changes it 5 mph and every tooth on the driven changes it 3 mph all of this is asumeing you have the large speedo gear housing
 
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