Shane,

never heard this one before.. I've had T jib for over 2 years. The only sound I hear is the motors running when panning, only when I'm not using the quiet drives. I would say check the bolts in the arms and make sure they're all seated properly, or check the clearance of any cables running down the arm. Could be a cable or something that hits something else when the jib gets to a certain position in it's movement..have you set up the T jib before?