Did a 3650 to 4r70 swap this past year and also went to a 325 50 r15 tire size. Last year vehicle speed on sct datalog was only off a bit based on time sheet and livelink. This past weekend I datalogged for the first time since and using the pid for vehicle speed. I trapped almost 100mph and livelink only shows 45mph. Is there a conversion formula I need to run? Thanks everyone!