Just started hearing a clicking noise coming from the rear of my 2004 Dodge Ram 1500....5.7 V-8 Hemi.....Checked both rear brake, and that doesnt seem to be the problem...From some research, I think it might be the drive tran, but not sure. I really hope this is not a long term problem as i use my truck for business.

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ABS and Brake warning lights intermittent may be caused by a failing wheel speed sensor(ABS Sensor) and /or its connector. You may have one on each wheel hub(4WD) or if 2WD, a sensor may be on the rear axle differential center.

Check your manifold bolts, the noise you hear is possibly a exhaust leak caused by a broken bolt.

there is a cut out switch thats gone faulty to start the motor the brakes need to be on,, but the switch is faulty and is cutting the motor out now!

If your engine has a broken exhaust manifold bolt it can cause a clicking sound which is a exhaust leak.

The clicking sound could be a broken exhaust manifold bolt which causes a exhaust leak that makes a clicking sound. The 4X4 problem could be just a linkage adjustment.

My 2004 Hemi did the same thing and it was the EGR valve, replaced it and all seems well now.

rear end differrential....have it checked

this is your camshaft pos. sensor

first i would check the tires , are they cupped or chopped on the tread? run your hand over the tread and see if it feels rough and uneven. take the truck to a auto repair shop and have them jack both front and rear axles off the ground, put the truck in 2 wheel drive and run the speedometer to the speed you usually hear the roaring noise, if you don't hear the noise , put the truck in 4 wheel drive, turn off the traction assist if it has one and run it to the speed you would hear the noise. if you hear the roaring noise with tires off the ground, the problem is in the drivetrain, (engine, transmission, transfer case, u-joints, differentials or the front left or right cv halfshafts or u-joints). the older models (97 98) had the front two driveshafts from the differential turning all the time, they engaged in 4 wheel drive from the transfer case and a solenoid on the front differential. depending on the miles you have on this truck, the most likely areas i would look at would be the tires, u-joints/cv joints, and front and rear wheel bearings. thanks and good luck.