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Originally Posted by twr
Hi do you know if the other owner had changed rear gears? If he did and never had the speedo recal that could be why the speedo reads fast. Also alot of guys change gears when they change to bigs tires because the trucks don't have any balls. Check the gear ratio first if your truck is 2003 to 2007 it came with 4.10 hope this helps.
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I don't know if the gears were changed, but wouldn't re-gearing make the speedo read slower instead of faster? Or is my thinking backwards...
I can adjust gear ratio with the programmer too, maybe I should play with that???