The thermostat is on the inlet side of the system on a 4.7. It is at the lower radiator hose.
If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.
CAUTION: Housing must be tightened evenly and thermostat must be centered into recessed groove in timimg chain cover. If not, it may result in a cracked housing, damaged timing chain cover threads or coolant leaks.