I have a 95.5 Tacoma that was recently lifted 2-3" in the rear. Afterwords there was a small vibration at the u-joints and I didn't think much of it. Now there are intermittant vibrations that sound like when you are driving on the grooved edge of the highway when I'm not. it comes and goes very quickly, usually goes away when I let off the gas. It is significantly louder and more noticable compared to the previous but sounds like its coming from the front of the truck. This only happens on the highway going faster than 50 MPH. I haven't had any trouble yet, any ideas? U-joints again?