I have a 94 jeep cherokee and it shakes at about 50 mph on up. I've had the drivelines checked out and theres nothing wrong with them. I have a 3 in. lift could it be something to do with that. It doesnt shake too terribly bad. but If i keep driving with it shaking for longer that 10 minutes it starts to leak transmition fluid from the bell housing, i think this i just because the whole jeep shakes and the seal in the bell housing is going bad. What could be causing this