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Old 07-20-2019, 01:53 PM #1
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Rear End Droning?

Hey everyone! Im in the process of trying to diagnose the source of a droning noise I am experiencing with my 05 4WD V6 SR5 T4R. I was hoping you guys could help point me in the right direction as I have attempted a few things without much change.

What is happening:
- A droning noise in the rear that is tied to wheel speed is occurring. Noise is most prominent at 30MPH, but gets a bit louder at higher speeds
- The noise goes away when cornering (either left or right, does not matter)
- Car pulls to the right at all times, whether when accelerating, when braking, and when coasting even with perfect alignment (feels almost like torque steer)

What I have already attempted to remedy:
- I have replaced rear brake pads + rotors (this seemed to modify the droning noise to be a bit quieter, but not eliminate it)
- lightly clean the parking brake mechanism (they appear to be extremely dirty, and my cleaning was not thorough)
- Tested Rear wheels for play (to check wheel bearing integrity)

What I plan to do:
- Replace parking brake mechanisms and shoes (My leading theory is a parking brake is dragging and causing the noise and car pulling to the right)
- Inspect Rear Diff Gear oil (could these be symptoms of a blown up rear diff?)

With the information detailed above, what do you guys think is the direction i should take in regards to troubleshooting? Im hoping my plans listed above should resolve, but I would greatly appreciate input if I am going the wrong direction with this all.
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Old 07-20-2019, 03:56 PM #2
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Check your rear wheel bearings for play.


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Old 07-20-2019, 07:26 PM #3
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Quote:
Originally Posted by CJFONNER View Post
Check your rear wheel bearings for play.


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I second this.
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Old 07-20-2019, 08:47 PM #4
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I just checked both rear wheels a few moments ago, no play seems apparent. Additionally, the car does not vibrate/oscillate at highway speed like it did when front wheel bears were bad.
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Old 07-20-2019, 09:22 PM #5
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When you replaced the rear pads and rotors did you also thoroughly check the calipers too insure they're not seizing even a little bit?

You say it pulls to the right when accelerating and braking, does this mean it doesn't pull when you're coasting/decelerating?
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Old 07-20-2019, 09:48 PM #6
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Quote:
Originally Posted by AuSeeker View Post
When you replaced the rear pads and rotors did you also thoroughly check the calipers too insure they're not seizing even a little bit?

You say it pulls to the right when accelerating and braking, does this mean it doesn't pull when you're coasting/decelerating?
I slide the housing back and forth across the slide pin prior to disassembly to confirm they travel fine without interference, but besides from that I did not do any further testing unfortunately. I did not consider a seized caliper at the time.

And no, it pulls at all times. I will rephrase the OP to remove that ambiguity.
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Old 07-20-2019, 10:32 PM #7
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Quote:
Originally Posted by Spriter View Post
I slide the housing back and forth across the slide pin prior to disassembly to confirm they travel fine without interference, but besides from that I did not do any further testing unfortunately. I did not consider a seized caliper at the time.

And no, it pulls at all times. I will rephrase the OP to remove that ambiguity.
On a seized caliper it is the piston/s that seize/gets stuck in the piston bore/s which causes the pad to be constantly pressed against the rotor and "dragging", a simple test without taking anything apart is too drive around a bit and then check each wheel hub for being warmer/hotter than the rest, none should be really very warm or hot but they could be slightly warm which is normal, if you have or could borrow a infrared heat gun/thermometer it works very well for checking the hubs for one or more being much warmer/hotter than it should be.

A severely seized caliper can easily make it pull, another thing that can cause it to pull is a defective tire, I replaced all of my tires about 6 months ago, before I had a bad right hand pull all the time and I figured it was either brakes or alignment or both, the tires were close to needing to be replaced so I figure I would start there and then do an alignment and then brakes....well after the new tires it drives straight as an arrow and I still haven't touch the alignment or brakes.

That being said even "good" tires can sometimes make it pull, so if you find that nothing else seems to be wrong try putting the tires from the left side on the right and the right on the left side and see if the pulling changes.

Tire road noise can possibly be the cause of your droning as well, but I think you need to have the differential checked to see if the pinion bearing is causing the droning.
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Old 07-21-2019, 10:19 AM #8
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Hope you find the issue and it’s an easy fix.

I have an ‘05 4x4 with 180k on it and the rear diff went bad internally in the gears. We noticed an odd noise 1.5 years ago and it got increasingly worse. I was shocked it was the rear diff and upon inspection the gears and internal pieces were not shiny and clean. The previous owner had never changed the fluid. It’s my wife’s car so that ruled out crossing a river or getting water in there too! ��

A shop should be able to diagnose this rather quick for you. I HOPE it’s not the rear diff and is something else though.
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Old 07-21-2019, 09:49 PM #9
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Quote:
Originally Posted by Spriter View Post
Hey everyone! Im in the process of trying to diagnose the source of a droning noise I am experiencing with my 05 4WD V6 SR5 T4R. I was hoping you guys could help point me in the right direction as I have attempted a few things without much change.

What is happening:
- A droning noise in the rear that is tied to wheel speed is occurring. Noise is most prominent at 30MPH, but gets a bit louder at higher speeds
- The noise goes away when cornering (either left or right, does not matter)
- Car pulls to the right at all times, whether when accelerating, when braking, and when coasting even with perfect alignment (feels almost like torque steer)

What I have already attempted to remedy:
- I have replaced rear brake pads + rotors (this seemed to modify the droning noise to be a bit quieter, but not eliminate it)
- lightly clean the parking brake mechanism (they appear to be extremely dirty, and my cleaning was not thorough)
- Tested Rear wheels for play (to check wheel bearing integrity)

What I plan to do:
- Replace parking brake mechanisms and shoes (My leading theory is a parking brake is dragging and causing the noise and car pulling to the right)
- Inspect Rear Diff Gear oil (could these be symptoms of a blown up rear diff?)

With the information detailed above, what do you guys think is the direction i should take in regards to troubleshooting? Im hoping my plans listed above should resolve, but I would greatly appreciate input if I am going the wrong direction with this all.
I had the exact problem. I can almost guarantee you that it’s a rear wheel bearing. Put it on four jack stands and put it in drive. Go listen to the rear wheels. Most probably the right rear. My bearing had no play in it when pushing and pulling on it. I sure could hear it when it was revolving.
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Old 07-21-2019, 09:59 PM #10
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New third member but not fixed HELP!
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Old 07-22-2019, 11:52 AM #11
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Bearings, especially rears dont always have play in them when they are bad. I would not rule those out. As mentioned earlier, put it up on jack stands and listen that way
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Old 07-22-2019, 01:33 PM #12
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Rear wheel bearing is definitely a droning sound. Pulling would indicate the stuck caliper or bad ebrake system.
Possible that you have two bad problems.
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Old 07-25-2019, 03:02 PM #13
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Thank you all for your advice, its helped me think this issue through! That said, I do have an update.

I have replaced my Rear Right Caliper and now have noticed a minor reduction in pulling, if any. Im still unsure if placebo is at play. When braking hard or accelerating, it still pulls to right. Also, almost no change in the droning noise was observed, it occurs just the same as before the caliper swap.

I have checked the wheel for scraping noise/resistance and did not notice any (only noise came from brake on rotor when tested in the air).

So now I'm some what unsure as what my next steps are. From the consensus in this thread and my findings it seems the following are the plausible theories:

-Seized FRONT RIGHT Caliper (why else would it still pull to the right?)
-A bad rear wheel bearing (Unsure if this is still plausible as no noise, resistance or wobbling is noted.
-Rear Differential is going bad
-Bad Parking brake (This would create the pulling, and could cause the aforementioned droning noise correct?)


Some more details to add:
After changing out the rear brake pads and rotors the droning noise was dramatically reduced, but nothing changed later on when swapping the caliper afterwards (this would indicate possibly a bad parking brake over a seized caliper correct?
When cornering, regardless of which side (left or right) the drone is modified and reduced to almost unnoticeable levels.
Droning noise "feels" like it is coming from LEFT REAR wheel, which is confounding
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Old 07-26-2019, 12:48 AM #14
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Have you supported the rear end and listened for wheel bearing noise with the rear wheels in the air?
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Old 07-26-2019, 07:58 AM #15
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Get it on a lift and check the pinon bearing for noise. Make sure you have qualified mechanic work on rear end. The preload on pinon bearing is important. The brake pulling could be calipers or front wheel bearing.
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