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Discussion Starter #1
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?
 
K

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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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Discussion Starter #3
What is a breather valve??
Or could it be bearings like they say?
 

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Discussion Starter #6
They said wheel bearings

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

Did you change the wheel bearings when you did the gears?
No
 
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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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Discussion Starter #8 (Edited)
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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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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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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^^ 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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Discussion Starter #12 (Edited)
^^ 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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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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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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Discussion Starter #16
Yeah he definitely did that.

The noise isnt a whining. sounds like gravel getting tossed around
 

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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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Discussion Starter #18
Yeah it's a low humming or rumbling sounds. Changes in speed for sure
 
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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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Good info Kevin.:thumb:
Now all we need is some good sound clips to go along with it. LOL
 
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