OK guys i'm running out of options. I have an 03 gt. I changed the rearend gears about a month ago. My dealer did the work but they cannot figure out how to fix my speedo. They insist that the speedo runs off the abs sensor wich abviously is'nt the case or it would'nt be off. I'm running into dead ends. The hypertech programmer won't work for anything over an 01. What do i do?