just purchased a 2003 SRT. I noticed when driving it home speedometer said I was doing 80 whereas my handheld GPS said I was doing 75. I’ve tested the handheld GPS in other vehicles and always found it to be accurate. Any ideas what could be causing this? Any idea of how I could have it corrected? It’s my understanding from reading other posts that the speedometer calibration comes off of the ABS brake system?? I appreciate any help. I am new to the Dodge Viper scene.