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Evening, the easiest way to remove the t-stat is from below. Here are the directions per the factory service info:
REMOVAL – 4.7L ENGINE
WARNING: DO NOT LOOSEN RADIATOR DRAINCOCK WITH SYSTEM HOT AND PRESSURIZED. SERIOUS BURNS FROM COOLANT CAN OCCUR.
Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse.
If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.
I'm attaching an imagine of its location.