if the vehicle is parked when it does it check the fluid level of your Power Steering fluid, if full check to see if the tsb's have been done by Chrysler yet. if it does it while driving, check your front suspension, you may have a worn wheel bearing, bad brakes or worn steering components
as far as the humming noise and the grinding noise it sounds like your power steering pump is either out of fluid or gone bad completely. as for the muffler? ?MAYBE? the strain from the bad power steering pump is overworking the engine causing it to make noise? answer definetly a bad steering pump as for muffler, the sound can be transfred and magnified on a car, replace steering pump before bothering about the muffler sound may be gone
A hummingbird
id say type and size of tire, and if bearings are bad either or will make that humming sound.
A Humming bird Benefits from Drinking the flowers because the flower comes like food to the Humming Bird.The flower Benefits from the Humming bird because the humming Bird pollinates it.
Pascagoula river
The heater makes a humming sound.
it could be your tires on the pavement.
Nectar makes up 90% of humming birds diets.
try humming and calming down and take pauses in a sentence
Worn steering parts.
that is probably your electic fuel pump nothing to worry about
it does that because it has a generator which makes the engine makes these sounds