TRANSMISSION SHIFTS HARDER AND SHAKES THE ENTIRE SUV. WHEN I PRESS THE GAS AND GET TO ABOUT 35-40 IT WILL START KNOCKING REALLY BAD AND FEELS LIKE IT'S LOSING POWER. WHEN I STOP THE EXACT SAME THING HAPPENS WITH THE KNOCKING. I WAS GOING 35 AROUND A SLIGHT CURVE ON I-45 FREEWAY BY LITTLE YORK SHEPARD GULF BANK AREA TO BE EXACT AND THE SUV WAS DRIVING FINE. I WAS JUST GETTING ONTO THE FREEWAY AT THIS TIME. HINTS THE REASON I'M NOT GOING SO FACE. WHEN I STARTED PICKING UP SPEED THE TRANSMISSION JERKED SO HARD I FLEW INTO THE NEXT LANE. LUCKILY NO ONE WAS AROUND ME BUT IMAGE IF I WAS IN TRAFFIC AND THIS HAPPEN.