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I went from 3.73 ratio to 3.27 which way do i go with speedo teeth more or less teeth has 21 tooth now.And can you get the gears at the dealer and are all automatics take sane gear it's for c4
 

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When reducing the gear ratio, you also need to reduce the number of teeth on the speedo driven gear. Assuming that your speedometer registered correctly with the 3.73, you need an 18-tooth speedo gear (3.27/3.73 * 21t=18.4). I dont' know if anyone makes an 18-tooth gear, but I know that my C4 has a 16-tooth, so there should be available gears in hte middle. Some transmission supply shops carry the gears. Take the gear in to the shop though, and take calipers with you to compare the dimensions of the parts.
 

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Local ford dealership, about 11 bucks.

I went from 3.25 to 3.70, had 18 tooth and went to 21 (which is the highest you can go without changing the inside gear). I think Ford calls it the driven gear.
 
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