Wondering if you can give me some advice? I just swapped a 03 cobra t56 into my 97 cobra that I am running 4.10 gears in with a 315/30/18 R888R. I had a Ford Racing Speed Dial in to correct my speedo after doing the 4.10 gears with my stock t45. With the T56 now in, my speedo is now way off. Do you know what I need to do to correct my speedo? thank you!