Speedo.

[NP06-2500]

I got the Diablo Predator and I programmed it to the tire size on the truck which is 33. I noticed that the speedo was then very very off. I called Diablo and they said that if the tire size is 35"+ it only programs the rear wheels. Well that did me no good and now my ABS light comes on cause the ABS module doesnt realize the front tires are different size but it knows the rear is. What can I do to solve this?

Thanks,
Chris