I posted how to switch out an 80 for a 100. But now I need to switch out the speedo gear at the tranny and I'd like to save money doing it myself. Last time I got the show to do it they bent me over. I'm going to say I now have a stock 1979 setup. 100mph speedo, Turbo 350, 3:08 gears. Is there a cut and dry chart or equevilent out there that will say I need this color with this amount of teeth?
