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ColoradoCummins 04-01-2005, 03:49 PM Hey guy's I have a question on re-calibration of the speedo after installing taller tires. I know from past experience with my Blazer that running 33X12.5's made the speedo read 7 miles per hour lower. How do I go about adjusting my 2004 when I switch to 35's? Does the switch alter anything else I should be concerned with?:help2: Bodysurfer 04-01-2005, 03:53 PM Get a handheld programmer like HyperTech or Predator. They allow re-cal for bigger tires and give you more power thru power settings. 2 birds...1 stone. As you can see in my signature below, I have 35's and currently use HyperTech. Good product. LATER! nickleinonen 04-01-2005, 04:06 PM i've got 315's under my ram, and no speedo correction... it reads pretty much 10% off so i just make mental calculations for the speed... the dealer can reprogram the speedo with the dbrIII scan tool, or you could pop for a superlift truspeed, or i believe the new BD RAD has speedo correction capability... as far as i know, there is no tuner box from anyone that will calibrate the speedo on the 3rd gen dodges... | ||