Some 2008-2010 4WD Toyota Sequoia and 2007-2010 4WD Tundra vehicles may have a ticking noise present only when in 4WD. Production changes have been made to correct this condition.
Chances are, the problem is easy to find and to fix. The parts label on the propeller shaft may have delaminated and is flapping in the wind, contacting other nearby areas.
If this is the case, simply remove the label from the shaft.
Nice to have an easy one for a change, isn’t it?