Can anyone give me detailed instructions on how to correct my speedo with the efi live software? 05 LLY, its lifted 6 inches and i run 35" bfg mud terrians, it has the 3.73 gears. I was told to use a GPS but i do not own one or have a need to buy one, theres got to be another way???

There is a tire size tool on the Speedometer section in EFILive Tune called Speedo Calculator I think. Enter tire size to place tire revolution values in.

Brian