Car won't run past 60mph

I have the lokar kit. I will also check to ensure I'm getting full throttle and while doing so ensure that the kick down is engaging fully. I read that when hooking up the lokar kit that you have just enough tension on it until you lightly feel the spring tension from the return spring. It may be to tight and not allowing fully throttle or to loose not allowing enough pressure. However, initially i thought i set it up right but i will recheck that as well.