Please I need help. I have a 2007 FJ that has a low speed vibration typically between 15 to 40 miles per hour. Its certainly not the tires or tie rods. I usually experience it when going uphill or when going on a level road when there is pressure on the drive system. It does happen when going downhill. I took it to the Toyota dealership and I'm not sure they have diagnosed it right, they are saying it might have something to do with the torque converter and consequently i should just have the transmission replaced. Any thoughts?