So I just upgraded the stock 27's to 32's and am planning to regear from 3.58 to 4.10. After the tire change my speedo and odo are obviously way off (by about 20%), but once I regear to 4.10's it should make them more accurate since I'm gearing the truck closer to stock ratios right? If that's the case, does anyone know how to factor in the regear when calculating speedo and odo discrepancies? Or does anyone know of calculators that take both tire change and gear ratio change into consideration?
If it's still too far off after the regear, i might consider buying a recalibrator like the hypertech http://www.autoanything.com/performa...0&AID=10561927 mainly to fix the odometer. My main concern with this particular unit is I've heard it doesn't actually plug into the OBDII and instead plugs straight into the gauge cluster. Has anyone used this unit and if so, how hard was the install and do you think it was worth the money?