It's hard to tell it's a smooth car it does seem to be a limiter but because the tranny was shifting funny earlier on makes me wonder because I thought I've done close to 100 before and I don't remember it stoping at 4k.. I was just curioous if the gtps are governed that way or not? Anyone know a top speed limit?? I'm going to have dirks check it out again I paid alot for that rebuild. I wish I wouldn't saved that money and put it towards a camaro;(