Ive researched this alittle bit, but i wanted some input from the guys here. Ive got a liberty that just got new tires, upper and lower rear end control arms, shocks, diff fluid, u-joints, the whole 9 yards. But i still get a rear end vibration at around 40-55MPH. I haven't tried highway speeds yet. Im lead to believe its a bad torque converter. If it is, do i need to replace the whole transmission? Or just the converter itself? Any help would be greatly appreciated!