i have 2 (5.0) mustangs ive gotten them up to 130mph on the highway but i have a 5 speed trans most automatic trans wont allow you to go past 90mhp.. justa depends on what gear ration you have in the rear end and if your car is auto or stick my 91 f150 has the same motor and the speedo tops out at 85 and ive gotteb it up to 90 aswell not safe to do so but i did it
