In 5th gear my rpm range will not go past 4k. When my car use to be a auto it also did this in D4. But if I put it in D3 I could get up too about 120 MPH at 6k rpm i din't want to push it any more so I never went faster. Some times it does'nt stop at 4k rpm usually when I'm shifting faster. I find this kinda weird, and the only thing I can think of is that their is a govenor. If it is how do I take it off.