Originally Posted by mbtoloczko

Normally, if you use the correct differential for the tranny you installed, (i.e., if the tranny came out of a car with 4.11 diff, and you installed a 4.11 rear diff in your SVX), then the speedometer should read correctly. You are the first that I've heard where the speedo isn't reading correctly. If you've installed the proper rear diff, and the speedo is still not reading correctly, send me a PM, and I can set you up with an electronic box that will allow you to make the speedo read correctly. The box costs $100.