My driveline has a vibration, enough so that if I rest my hand on the shifter going down the road it goes numb. It's high frequency. There's also a cyclical growl coming from the rearend at hiway speeds but it don't seem to match the shifter as far I as I can tell. I took the driveshaft off and the u-joints are nice and tight and other than the smallest amount of radial play, the slip yoke is tight. U-joints are in time. So, do I need to pull the third member and have it rebuilt? or is everything I just described considered "normal" for a fj-40?