Ok, I know this has been covered before, but I still have a couple questions. I just drove a guys '69 model 5 with the 6 and I kind of noticed the speedo seemed off, like it was reading way too slow for how fast I was driving. It has 31" tires, like mine has now. I noticed someone mentioned a chart that gives gear ratios with gear tooth count but the link is bad, I guess from when the site was down. Anyway, can someone give me a simple solution to this. I have 3.73 gears and will be running 31" tires. I also have a brand new NOS speedo with the orange dial and a D18 TC. Is there an aftermarket gear to set the stock speedo to the correct speed? If not, I have heard of an aftermarket speedo cable that you can adjust. Is there such a thing that will fit my jeep?