I have an app. on my phone which i use to calibrate speedometers. It updates slow sometimes but is accurate. I also have .72 overdrive with the T-5 that helps. When I was 17 i completely rewired a 48 ford with flathead 6. That truck sounded loud at 45. And wouldnt want to drive long much at 55. This is much nicer than the ford in regards to drive able.
