I have trouble with grinding gears only when I am shifting at redline from 3rd to 4th gear but have no trouble any other time. I have an exedy lightened flywheel, exedy clutch, Kartboy SS and bushings with Mobil 75-90 synthetic fluid. Could it be the syncros? They work every other time of could it be the clutch on its way out? I have a clutchmaster stage 3 waiting to be installed so it’s not a big deal. Just wanted some opinions?