max speed for 02

my friend wanted me to list this. he has a 2002 dakota, 2 wheel drive, 4.7 v8, 5 speed trans, 3.92 rear. what does the motor cut out at. i dont think it will go past 120mph. the truck is fast as hell but when your doing 115 or so, it dont go much more, it cuts out. how do we get rid of that. is there a way?

5 speed auto or manual?

If auto, keep it out of overdrive. If manual, leave it in 4th gear. Try that.