duct tape & zip ties
Join Date: Jul 2006
Location: Willis, MI
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The simpliest way to correct the speedometer, is to get true speed, or the speed correction computer from super lift. Those are the only two I know of. They plug into the wiring harness, and your done a simple plug and play unit. Also if you ever take them tires off and go to a smaller tire lets say as if you sell the truck. You can keep the speedometer corrective computer. This way if you get another truck you can hook it up to that one if you put bigger tires on it. It is the simpliest way I know to do what you are wanting to do.
Your teacher was correct on that one tooth is approximately 3 mphs. Bigger gear ( more teeth) means slower speeds, smaller gear ( less teeth) means faster speeds. I believe you would have to go to a bigger speedo gear for what you are trying to do as well. If you wanted to switch the speedo gear. being your stock tire size was 265x75xr16 or 31x11.50r16, now your going up to 35x?xr16, 315x?xr16, that is if you are keeping the stock tire size. I believe you would need to go up 2 teeth on the speedo gear to get the closest correction by switching out the gear.
Your Actions Today, Decide Your Future Tomorrow
2005 6.0 Crew Cab Long Box Lariat, current truck
2004 6.0 destroyed by contaminated fuel
2002 7.3L burnt