check your wheel bearing
Have you checked your transmission fluid? Try that Cindy
The 2004 Ford Expedition typically comes equipped with a 4-speed automatic transmission, specifically the 4R100 or the 4R75E transmission, depending on the engine configuration. This transmission is designed to handle the vehicle's power and towing capacity, making it suitable for both everyday driving and heavier loads.
Check your fuel pump
wheel bearing
Unplug it.
The differintial is starting to wear...
Your dishwasher may be making a humming noise due to a faulty motor, clogged pump, or a malfunctioning water inlet valve. It is recommended to check these components and consult a professional if needed to resolve the issue.
possibly your running RCAs on the same side as your power cable
Your water heater may be making a humming noise due to sediment buildup in the tank, a faulty heating element, or a loose component. It is recommended to have a professional inspect and repair the water heater to prevent any further issues.
Your furnace may be making a humming sound due to a variety of reasons, such as a malfunctioning blower motor, loose components, or a clogged air filter. It is recommended to have a professional HVAC technician inspect and repair the furnace to prevent any further issues.
Your outside AC unit may be making a humming noise due to a faulty capacitor, a malfunctioning fan motor, or debris blocking the unit. It is important to have a professional HVAC technician inspect and repair the unit to prevent further damage.
Possible wheel bearing going bad.