4l60e with 3000 TCI stall makes noise in 4th gear going into lockup like maybe it is slipping bad if you stay in throttle it will fully lock and noise goes away. Car has 389 gears stock bottom end with Trick Flow heads and cam package etc. 430 rwhp 400 ft/lbs at tires. Misfires turned off etc. also worked a little with PWM change and did some changes with TCC lockup speed vers TP did help some but still there. Any help would be great!!