It's a 4WD Jeep Grand Cherokee Laredo 5.2L MFI V8..When I'm driving my car it starts to shake like crazy only from the LEFT FRONT WHEEL..I get scared at time that i start to tap the brakes and move the steering a left and right really quick so it can stop from shaking, i don't know what it is but i need to know so i can replace it..Can anyone help me please? *10 POINT'S*