My brother just bought a truck that was said to be chiped. Well the PCM still has the coating on it and I heared that there is another way they could have done it and that would be under the hood somewhere. I have no clue where to look now. The truck sits on 38"s and has no problem spinning the tires and if you drive hard the trans starts to shift harder and it will chirp the tires in 3rd. I am just trying to find out if it is chiped or what?