Originally Posted by
info@gallatinautorepairs.
I can't seem to find the tire wizard that I see posted everywhere on the internet. My gear tire wizard only offers me one input Gear/Tire. There is no place for me to enter tire sizes, gear ratios, nothing. I'm supposed to know the number for my customer's car and I just plainly don't I suspect that the car has a replacement speedo as the diff ratio is the same as the option RPO code which is 2.08. The current number in the gear wizard is 8.02 but I have no idea how this number was derived.
The car is a 98 Camaro convertible with a 3800. Wheel speed sensors all indicate 55 mph with GPS reading 56. I'd be fine with that but the VSS and the speedometer rear 78 MPH! My customer brought it to me because I had done tunes on several of their cars. I'm completely clueless and I'm hesitant to even buy credits for the car. since these ratios also effect the transmission which works okay, (I think that it's shifting way too soon at low throttle) any help would be appreciated.