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What would cause a noise coming from the what I think is rear of my 2005 Dodge Ram 1500 4X4 that gets louder and higher pitched faster go?

Differential:

- Low fluid level

- Worn gears or bearings

Wheel bearings:

- Worn bearings

Driveshaft:

- Bent or damaged shaft

- Failed or misaligned universal joint or carrier bearing

Exhaust system:

- Loose or damaged components, such as the muffler, exhaust pipe, or catalytic converter

Suspension:

- Loose or damaged components, such as the shocks, springs, or control arms

- Damaged bushings

Brake system:

- Warped brake rotors or drums

- Worn brake pads or shoes

Fuel system:

- Problems with the fuel pump, injectors, or lines, which could send an incorrect amount of fuel or create turbulence