Last year, when I switched to the 9 inch rear, I installed 4.10 or 4.11 gears in the rear. Well, my old 8 inch had 2.79 gears in it. I know when I hook my speedo back up... (installing autometer 160MPH) its not going to read right. So what do I need to do to fix this? I have a C4, and from what Im told, they don't make new speedo gears for different ratios... they were all the same. So what option does this leave me?