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Old 08-17-2015, 12:55 PM   #1
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Rear end noise!

sounds like a helicopter. Dealership says I have bad wheel bearings, but that I should get my differential checked out. Aren't the wheel bearings in the differential? Just had my gears replaced less than 15k ago. And got it lowered

Anyone know what it is?
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Old 08-17-2015, 12:59 PM   #2
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I believe the bearings are near the wheel hub area of the axle iirc. Also, some people reported the breather valve on their differential went bad and made a sound like this.
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Old 08-17-2015, 01:06 PM   #3
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What is a breather valve??
Or could it be bearings like they say?
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Old 08-17-2015, 01:14 PM   #4
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Did you change the wheel bearings when you did the gears?
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Old 08-17-2015, 01:16 PM   #5
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Also are they talking wheel bearings or axle bearings?
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Old 08-17-2015, 01:19 PM   #6
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They said wheel bearings

---------- Post added at 01:19 PM ---------- Previous post was at 01:18 PM ----------

Quote:
Originally Posted by Socal Stangman View Post
Did you change the wheel bearings when you did the gears?
No
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Old 08-17-2015, 01:24 PM   #7
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If the shop does a sloppy gear install, they can bust up the bearings when they take out and put back in the axles. New bearings are like $40 on AM.
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Old 08-17-2015, 01:29 PM   #8
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The dealership said it was a gravel sounding noise. And that its coming from the wheel bearings.

The humming helicopter noise could be my axel bearing, it was NOT replaced when gears were installed.

Im going to see if there is any noise tomorrow once my wheel bearings are replaced
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Old 08-17-2015, 01:59 PM   #9
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Originally Posted by LavaRedSixxer View Post
The dealership said it was a gravel sounding noise. And that its coming from the wheel bearings.

The humming helicopter noise could be my axel bearing, it was NOT replaced when gears were installed.

Im going to see if there is any noise tomorrow once my wheel bearings are replaced
Like Kevin said, if they weren't careful its easy to ruin those bearings. The place that did my gears wouldn't even the job without replacing them. Its true, it doesn't make sense to skimp on a 40.00 part. Im not saying this is your problem, but it is a possibility.
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Old 08-17-2015, 03:17 PM   #10
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The bearings located at the wheels are referred to as axle bearings or wheel bearings.

Within the differential: front and rear pinion bearing and the differential bearings
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Old 08-17-2015, 03:43 PM   #11
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^^ Yea, slipped my mind. You have Axle Bearing and Pinion bearings. IF the pinion bearing is bad, then the differential would need to be rebuilt. If it is just the Axle bearing, then that is a little easier to do.

Of course, I wouldn't rule out the breather valve on the differential either.
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Old 08-17-2015, 05:00 PM   #12
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Quote:
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^^ Yea, slipped my mind. You have Axle Bearing and Pinion bearings. IF the pinion bearing is bad, then the differential would need to be rebuilt. If it is just the Axle bearing, then that is a little easier to do.

Of course, I wouldn't rule out the breather valve on the differential either.
So what the heck was that dude at the dealership talking about? He wasn't the mechanic but the guy that answers the phones in the servicing department.

He clearly said wheel bearings. And sound coming from differential
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Old 08-17-2015, 05:22 PM   #13
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I personally would say get your car on a lift and spin the rear wheels. See if you can hear where exactly it might be coming from If it is the wheel/hub area, then it is your axle bearings. IF it is coming from your differential area, it could be the pinion bearing or something else. Further listening and isolation will help you determine what exactly it might be.
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Old 08-17-2015, 05:26 PM   #14
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Quote:
Originally Posted by LavaRedSixxer View Post
So what the heck was that dude at the dealership talking about? He wasn't the mechanic but the guy that answers the phones in the servicing department.
If he's just the service writer, I wouldn't put too much stock in what he says until a (good) mechanic has a look.
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Old 08-17-2015, 05:33 PM   #15
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+1 on Tym

and did you adjust/check pinion angle after lowering?
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Old 08-17-2015, 06:27 PM   #16
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Yeah he definitely did that.

The noise isnt a whining. sounds like gravel getting tossed around
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Old 08-17-2015, 06:41 PM   #17
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A carrier or axle bearing going bad is going to sound like a low rumble that varies in pitch with speed. Is that what you have? If it's more of a scraping sound, could be something else (like bent dust shield touching the brake rotor, etc.).
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Old 08-17-2015, 07:37 PM   #18
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Yeah it's a low humming or rumbling sounds. Changes in speed for sure
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Old 08-17-2015, 07:39 PM   #19
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Noise: Howl while decelerating (gears previously quiet)
Cause: Loose pinion bearing preload

Noise: Howl with whir or rumble while accelerating at any speed (gears previously quiet)
Cause: Worn rear pinion bearing or worn gear set

Noise: Howl without whir or rumble while accelerating at any speed (gears previously quiet)
Cause: Worn gear set due to lack of lubrication or overloading

Noise: Howling while accelerating over a small speed range (gears previously quiet)
Cause: Worn gear set due to lack of lubrication or overloading

Noise: Howling after gear set installation
Cause: Faulty gears or improper installation

Noise: Low-pitch rumble at all speeds over 20 miles per hour
Cause: Worn carrier bearings

Noise: Whirring during acceleration/deceleration at about 10 miles per hour
Cause: Worn pinion bearings

Noise: Banging or clunking while making a turn, backing up, or rapid deceleration (like on a freeway off-ramp). Noise gets worse in warmer weather
Cause: Posi chatter due to improper lubrication; worn clutches or spider gears; improper assembly

Noise: Banging, crunching, or popping while making a turn. Noise not affected by temperature
Cause: Badly worn or broken spider gears

Noise: Banging or heavy clicking every two to three feet during acceleration and deceleration
Cause: Damaged or broken pinion gear tooth or teeth

Noise: Banging or heavy clicking every two to three feet during acceleration or deceleration, but not both
Cause: High spot or heavy chip on pinion gear tooth

Noise: Banging or heavy clicking every eight feet during acceleration and deceleration
Cause: Damaged or broken ring gear tooth or teeth

Noise: Banging or heavy clicking every eight feet during acceleration or deceleration, but not both
Cause: High spot or heavy chip on ring gear tooth

Noise: Clicking while decelerating from 20 miles per hour to a complete stop
Cause: Worn carrier case-side gear bores

Noise: Rumble or clicking that gets worse during hard turns
Cause: Bad wheel bearings

Noise: Driveline squeaking or grinding at any speed
Cause: Worn or damaged U-joints

Noise: Clunking when depressing the throttle pedal (takeoff)
Cause: Worn U-joints; worn spider gears; worn axle splines; excessive gear backlash; loose yoke splines; worn slip yoke splines

Noise: Clunk immediately after taking off from a stop
Cause: Worn slip yoke splines

Noise: Steady vibration that increases with speed
Cause: Worn U-joint or out-of-balance driveshaft

Noise: Cyclic vibration that varies in intensity. Intensity increases at a specific speed range, worsens during deceleration
Cause: Pinion angle too low (not parallel with front yoke on driveshaft)
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Old 08-17-2015, 08:43 PM   #20
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Good info Kevin.
Now all we need is some good sound clips to go along with it. LOL
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Old 08-17-2015, 08:50 PM   #21
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Lol XD my google-fu is only that of a tangerine belt. Maybe a black belt will chime in.
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Old 08-17-2015, 09:22 PM   #22
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Don't know if its been said yet but if you have an adjustable panhard bar it can become loose and rattles like hell. Good luck figuring it out

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Old 08-17-2015, 09:33 PM   #23
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Don't know if its been said yet but if you have an adjustable panhard bar it can become loose and rattles like hell. Good luck figuring it out
That's definitely worth checking too. I had that happen to mine and it sounded like a loud tapping coming from the right rear trunk (since that's where the bar bolts to the body). Some thread locker and elbow grease solved that problem.

What the OP describes sounds different, though...
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Old 08-18-2015, 05:22 AM   #24
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Kev!
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Old 08-18-2015, 08:03 AM   #25
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Kev!

What's up?
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Old 08-18-2015, 08:39 AM   #26
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Here's a little something that wouldn't take a lot of effort but could possibly help detect the location and/or source of the noise, particularly if the noise is fairly prevalent.
The traditional way of checking sealed wheel bearings is to rotate each wheel by hand while listening and feeling for any roughness or play in the hub. On late model vehicles with sealed wheel bearings or bearing cartridges, there should usually be little or no play, and certainly no roughness or noise.
(Unfortunately, wheel bearings generally wear only on the load-bearing side. When the vehicle is placed on a lift or is jacked, the bearing begins to roll on the non-load bearing side, which eliminates most of the rotating noise.)

The crude way to check for play is to raise the vehicle so the wheel is off the ground, then grab tire at the 12 o’clock and 6 o’clock positions and rock the tire back and forth. If there is any noticeable play, the bearings are loose and need to be replaced.
If there is just a little play, the amount of play can be measured with a dial indicator. Place the dial indicator against the hub and rock the wheel in and out. As a rule, there should be no more than .005 inches of play in the bearings if the bearings are good.
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Old 08-18-2015, 10:00 AM   #27
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Called back today and he confirmed that it was the rear wheel bearings. Picking it up in a couple hours. Hope they were right.

Idk how they could tell if there was differential noise by driving it. I don't hear any gear whine or anything except that humming
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Old 08-18-2015, 07:29 PM   #28
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Okay so my wheel bearing noise is gone.

Now I can hear the whirring noise when I let off the gas.
Also oil on the outside of the differential.

Going to the gear guys shop tomorrow that installed everything for me
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Old 08-18-2015, 07:31 PM   #29
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Okay so my wheel bearing noise is gone.

Now I can hear the whirring noise when I let off the gas.
Also oil on the outside of the differential.

Going to the gear guys shop tomorrow that installed everything for me
This sounds familiar to me, does it sound like chirping noise?

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Old 08-18-2015, 07:35 PM   #30
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Okay so my wheel bearing noise is gone.

Now I can hear the whirring noise when I let off the gas.
Also oil on the outside of the differential.

Going to the gear guys shop tomorrow that installed everything for me
I have a feeling it is the breather valve overflowing. Whirring noise could be the shimming is off a little.
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Old 08-18-2015, 07:38 PM   #31
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Or.... It's the u joint? I have a video of it but don't know how to download it here.. Does it go away when it warms up?

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Old 08-18-2015, 08:19 PM   #32
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No it still does it after it warms up. It's not a chirping sound, hard to describe. Whirring sound it the best way to describe it. Not very high pitch, more and not too loud but noticeable.

Why would gear oil be on the outside of my differential? Will the breather valve do that like Kevin is talking about
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Old 08-18-2015, 08:33 PM   #33
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No it still does it after it warms up. It's not a chirping sound, hard to describe. Whirring sound it the best way to describe it. Not very high pitch, more and not too loud but noticeable.

Why would gear oil be on the outside of my differential? Will the breather valve do that like Kevin is talking about
Yep, i had mine replaced under warranty. There is a tsb, its such a ghetto fix and it still leaked lol. Oh well.

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Old 08-18-2015, 08:35 PM   #34
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People have reported a ticking like sound when the gear oil overflows out of the breather valve. This might explain your noise as well as fluid outside the casing. Sometimes the shop will have to replace the breather filter.
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Old 08-18-2015, 08:37 PM   #35
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Ill post a pic maybe tomorrow of the tsb repair for the breather. It gets a fat 2 out of 10.

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