Can some tell me, Is there a bushing or bearing on the A340E tail housing behind the tail housing oil seal? I have what appears to be a drive-line vibration and the only thing I have not ck or replaced is the transmission. After new U-joints, new gears the vibration still there. It only happens while coasting or slowing down. I was thinking, either, I have a worn out driveshaft slip yoke or a bad transmission output shaft. There is some play on the drive shaft slip yoke while inside the trans. I would say about 1/16th" +-. Is this play normal? Or it should not be any play at all?