Just a quick one here, as the title says my speedo reads about 30% fast, at 25mph i read 35. at 45 i read 60. and at 85 it reads 110 and limits the truck. I do have an edge insight monitor that confirms the numbers of the dash and i used gps to verify the difference.
at 55(reading 70) im running 1500-1700 rps
i’ve replaced stepper motors, replaced abs wheel speed sensors. the only thing i haven’t replaced is the vss.
is it possible that the person who owned it before me swapped the gear ratio and never disclosed it? or is there something else that could cause a 30% over read. with the speed being off its over mileaging the truck. im not going to sell it but it would make it nice to have proper reading for maintenance and because i have warranties on the truck and its wasting miles.