Not sure if this has already been posted but through my searches of the site I haven't come across anything like it.
I was lookin on EBAY to find a black 20 tooth speedo gear and came across this calculator. http://www.sccoa.com/faq/speedgr.html Not sure on how accurate but it seems to be right on in my case. I have a Tremec 5 speed which I believe has a 7 tooth yellow drive gear and was told the rear end was 3:73. I am running 275/45 17 inch tires. It had a white 23 tooth speedo gear which once the speedo cable was fixed and hooked up showed about 10 Mph low at 60 Mph. I bought a red 21 tooth gear which I had been told would be the right gear but it still came up 3/4 Mph low. I figured dropping another tooth would correct another 3 Mph and get me as close as possible. According to the calculator with my setup it shows that I would need a speedo gear with 19.7 teeth, so a 20 tooth gear would be the closest possible solution.
With all the questions of what gear do I need maybe this could be a sticky or added to the index thread
I was lookin on EBAY to find a black 20 tooth speedo gear and came across this calculator. http://www.sccoa.com/faq/speedgr.html Not sure on how accurate but it seems to be right on in my case. I have a Tremec 5 speed which I believe has a 7 tooth yellow drive gear and was told the rear end was 3:73. I am running 275/45 17 inch tires. It had a white 23 tooth speedo gear which once the speedo cable was fixed and hooked up showed about 10 Mph low at 60 Mph. I bought a red 21 tooth gear which I had been told would be the right gear but it still came up 3/4 Mph low. I figured dropping another tooth would correct another 3 Mph and get me as close as possible. According to the calculator with my setup it shows that I would need a speedo gear with 19.7 teeth, so a 20 tooth gear would be the closest possible solution.
With all the questions of what gear do I need maybe this could be a sticky or added to the index thread