Well, the Hemi's have a "redline" at about 5,500 rpm. You'll know it, it won't go past that, it has a rev limiter and will stop power and wont go past 5500. Do you have an automatic? If so, then it will shift at 5500. If you have a manual, and you go to 5500, you'll feel the rev limiter. Try it, its not too bad for it, just to feel it, so you know.