I have a 96 gt mustang that has been modified with 3.73 gears in the rear end and my speedometer is showing a lot faster than I am really going. I've been told I just need to change the gear on the speedometer cable to match that of the gearing in the rear end. My question is where can I go to find the speedo gear to be able to fix that and also get my odometer working as well. Thanks in advance for any help.