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Well I definitely have the factory 9 bolt, but the previous owner claimed they were changed to 3.73.
I can't open that link right now because my work server thinks it is porn, but I'm guessing it shows availble gear ratios for a 9 bolt.
I'm taking the GTA to the shop today and he said he would take a look. He mentioned that they did turn the rear wheel and count the driveshaft and that it was 3.73. He also said that they got the speedo gear from a GM dealer with 44 tooth driven which sounds correct. I'm thinking maybe they never changed the stock 17 tooth drive to the required 15 tooth.
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"Quality means doing it right when no one is looking."
- Henry F*rd
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