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Got 129000 miles on my 2013 250 4wd DSL. I tow a 14000 fifth wheel from one wildlife refuge to another.
In the last 6 months I've been hearing a slow grinding noise which seems to match the rotation of the wheels.
I thought at first that the U-Joints were the cause and had them replaced. Nope
I had the rear end jacked up and had the wheels engaged hoping to find where the noise was coming from, nothing again
and I also checked the fluid level in the deferential, no problem there.
What about the rotor stone shields up front and backing plates in the rear contacting a rotor?
Check those caliper brackets (non)slider pins and look for a hung up caliper piston.
Have the tires been off lately? Spin each tire to see if it wobbles, you'll see the caliper move too. If yes check to see if rust scale is pinched behind the rotor and hub, You wont feel this slight wobble on the road but you'll hear it, similar to a dry u joint. Ask how I know this one.
If the truck sees anything but desert dry weather check the Ebrakes on the rear. Ill bet the shoe retainer pins pulled through and your nicely grindging up the now freely floating shoes and whats left of the hardware.
My money is on the rotted rear backing plates. Nother awesome design repeated for at least 16-17 years.
This made the sound your describing. Can't edit and add pics to the last post sooo Ill post another reply with pics of the mess...This is the notorious rotted rear brake backer plates and my temporary fix. This is at ~55K miles. The new springs, pins, pin retainers are out of a drum brake hardware kit. Once it's installed I pack the outside of cavity where the washers now live with grease. Two of the fender washers need to be shaved to fit flush against the backer. I'll be going in for pinion bearings soon so the new backer plates will get nickel plated and replaced using the old style retainers...Older IS better.
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Wheel bearings
