I bought a programmer III and it asked if I had traction control, I do not know if I do or not. I chose no and went on. Then it asked to enter tire height, I have 285 goodyear wrangler mt's. I measured them at 31.5 inches high is this the correct number? I am wondering because it seems to shift alot faster now but the truck is alot faster too and maybe the tranny is just trying to keep up and seems to shift faster??????? I dunno??? Anyone out there know?? Edited by: clark_bailey