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Rear end noise

Tiny
DIVIDES
  • MEMBER
  • 2005 FORD MUSTANG
  • V8
  • 2WD
  • AUTOMATIC
  • 191,000 MILES
Whenever I hit the brakes I hear a sound similar to what the sound when brakes are gone in rear, but brakes are good, rotors are okay. Little rust from rain or whatever but nothing that should make that noise. Raised both wheels and spun them no noise at all. No play in wheels, but when I move the wheels back and forth in 2-inch movements I hear clicking that I am not sure if it is coming from inside the axle tube, this is where I hear it. I think from video you will see that the driveshaft play is good, nothing crazy. I also see a leak in differential, possible that it is low, how do you fill it. I don't see any fill or drain plugs. I may change the gasket first and see.
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Monday, January 17th, 2022 AT 9:23 AM

9 Replies

Tiny
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  • 898 POSTS
Also, what I meant to ask is, since this car doesn't have typical axles, does the rear end fluid circulate to the axle hollow pipes on each side if the rear end, indicated in the picture in red. I think this is where I hear the noise, and I suspect either a bad rear end or no fluid.
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Monday, January 17th, 2022 AT 9:55 AM
Tiny
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  • MECHANIC
  • 108,310 POSTS
Hi,

Yes, the gear lube gets into the axle tubes to lubricate the bearings. Now, you indicate a noise. Does it sound like it comes from near the end of the axle tube (near where the wheel is)?

If it does, then it sounds like the problem is the axle bearing. There is an axle bearing and seal at the end of the axle shaft. See pic below.

Let me know if that is where the noise is coming from.

Joe

See pic below.
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Monday, January 17th, 2022 AT 5:29 PM
Tiny
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Not near where the wheels are. No bearing sound at all. Kind of in the middle. I drained the fluid which looks like it never did get changed and it was not a lot. I will fill it up tomorrow and let you know.
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Monday, January 17th, 2022 AT 6:35 PM
Tiny
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  • MECHANIC
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Hi,

Sounds good. In the differential, there is a carrier bearing and a pinion bearing. Let me know if the noise goes away. Also, let me know the size of the differential you have.

Take care,

Joe
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Monday, January 17th, 2022 AT 7:16 PM
Tiny
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I believe the noise is pretty much gone after fluid change, thanks for your help.
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Wednesday, January 19th, 2022 AT 1:36 PM
Tiny
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I am talking about the rear end noise, but the brake noise is until there whenever I hit the brake, I hear a whistle from rear wheel. Maybe because it had some rust from sitting but I drove it few miles and back sea. Weird. Brakes are good, bearings okay.
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Wednesday, January 19th, 2022 AT 1:37 PM
Tiny
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Hi,

How are the brake rotors? Are they glazed (shinney) or is there anything marking them? If it is a squeal, usually it is the result of brake dust build-up or rust/dirt. Also, it can be the result of brake pad material and/or design. Did you install the pads? What kind were used?

Is it loud enough for you to upload it for me to hear?

Let me know.

Joe
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Wednesday, January 19th, 2022 AT 2:03 PM
Tiny
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I did not install it, whatever came on it. I hear it while driving but I may be able to get a video in the driveway.
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Wednesday, January 19th, 2022 AT 2:10 PM
Tiny
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  • MECHANIC
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It could be the result of the rust. I have actually had brake pads that were designed in a way that they would collect brake dust and make noise. You could take them apart and clean everything with brake cleaner. I'll often take sandpaper and clean the glaze off the pads and rotor as best as I can. The rotor is a bit more difficult to clean.

Also, they make a brake squeal eliminator you could get. It is placed on the backing plate of the pad which helps eliminate noise. See the pic below for an example.

Here is a link that explains in general how to replace the pads and rotors. I'm not suggesting they need to be replaced, but rather providing directions for taking them apart to service them.

https://www.2carpros.com/articles/how-to-replace-rear-brake-pads-and-rotors

Looking at the rotor, it does appear a little rough. Is the opposite side in the same condition?

Let me know.

Joe

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Wednesday, January 19th, 2022 AT 5:20 PM

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