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I have a 700R4 in my 57 210. My speedometer is inop, I have replaced the cable and turned the speedo by hand. I suspect the speedo gear is my culprit at this point. I was curious what tooth gear should I buy? As far as I know I have the stock rear diff and gears. Thanks in advance!
 

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NV... To figure out what gear you need so your speedo will be accurate, you'll need to know the rear gear ratio and tire diameter....See quote below.

Twelve speedometer driven gears are available for the 700R4 / 4L60 transmissions to calibrate the speedometer with various axle ratios and tire diameters. The number on the driven gear housing must match the number of teeth on the driven gear. Unless driven gears with more than 45 teeth and / or drive gears with fewer than 15 teeth become available, it will be impossible without using a ratio adapter to have an accurate speedometer with rear end gear ratios lower (higher numerically) than 4.10:1, unless 27 inch or larger tires are installed.

Link: http://www.transmissioncenter.org/GM_Speedometer_Gears.htm
 
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