GL Class (X166) 2013-2015 after facelift became GLS (X166)

Whining/bearing sound from the rear. X166, GL350

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Old 01-15-2022, 12:25 PM
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Whining/bearing sound from the rear. X166, GL350

Hi, need some advice.
My GL is marking bearing noise from the rear end at 40 km/h. Its increasing and at 55km/h i can hear whining sound. At 60km/h it disapears and comes again from around 80-100 but with much lower noise.
Noise appears only when accelerating. If i release the pedal sound stops immediatelly. All the oils in transmission are changed. Any suggestions?
Mulleage 150k km.
https://youtu.be/1EcDJA4agDw
Old 01-15-2022, 03:10 PM
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Something is not right in the driveline: propshaft, differential or halfshafts.

Whining means high speed, which means either differential or propshaft.

Is there any vibration noted? If you swerve relatively aggressively at highway speed (carefully with no one around you), does the noise change on one side or the other?

Could be bearings or gears in the differential.
Old 01-17-2022, 07:47 AM
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Originally Posted by chassis
Something is not right in the driveline: propshaft, differential or halfshafts.

Whining means high speed, which means either differential or propshaft.

Is there any vibration noted? If you swerve relatively aggressively at highway speed (carefully with no one around you), does the noise change on one side or the other?

Could be bearings or gears in the differential.
Hi,

thanks for reply. I have some very slight vibration sometimes on ~100-120 km/h. i thought it's wheels disbalance, but i can feel this slight vibration only some times. so wheels shouldnt be the case.
If I swerve - there is no change in that noise. on the highway this sound is really hart to notice so actually no chance to check if it's changing between the sides.
Bearings of gears shouldn't be as the same noise is while driving on any gear. main indicatior is speed.
Main problem is that it's very hard to diagnose such thing, but it's really annoyng and i dont know how much I can trust this car on long road trips.
Old 01-17-2022, 09:28 AM
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Originally Posted by J0nas
Hi,

thanks for reply. I have some very slight vibration sometimes on ~100-120 km/h. i thought it's wheels disbalance, but i can feel this slight vibration only some times. so wheels shouldnt be the case.
If I swerve - there is no change in that noise. on the highway this sound is really hart to notice so actually no chance to check if it's changing between the sides.
Bearings of gears shouldn't be as the same noise is while driving on any gear. main indicatior is speed.
Main problem is that it's very hard to diagnose such thing, but it's really annoyng and i dont know how much I can trust this car on long road trips.
I would focus on propshaft and rear differential.


Tip in/tip out noise as you indicate means torque related. No side to side noise as you indicated means not the wheel bearings or halfshafts.
Old 01-17-2022, 09:11 PM
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Wheel bearing noise do not disappear with the speed. Faster you go, louder it become.
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Old 01-17-2022, 10:31 PM
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You said there is a vibration. This is likely propshaft related. Differential bearing and gear noise is high frequency audible, not a vibration.

It could be propshaft flex coupling, center bearing or u-joint.
Old 01-24-2022, 02:51 AM
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Just got the diagnose from one of the repair centers. It's the transfer case making sound. They checked this one on the hydraulic car lift. There is DYNO mode on Mercedes, which allows to check such cases.
My question would be if anyone could help with precise part number of the transfer case for the X166 190kW GL350 without off road package.
Old 06-14-2024, 05:57 PM
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2017 GLS 450
Originally Posted by J0nas
Just got the diagnose from one of the repair centers. It's the transfer case making sound. They checked this one on the hydraulic car lift. There is DYNO mode on Mercedes, which allows to check such cases.
My question would be if anyone could help with precise part number of the transfer case for the X166 190kW GL350 without off road package.
Did you ever get this fixed or find out what the part/problem was? My 2017 GLS 450 is doing the same thing. Slight/Soft grinding sound, only under acceleration at lower RPMs - doesn't matter which gear.

It's not the turbo wastegate loose as when the car is not in gear, revving the engine does not produce the same sound.

Driving me crazy!
Old 06-18-2024, 12:09 AM
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2017 GLS 450
Originally Posted by x166gls
Did you ever get this fixed or find out what the part/problem was? My 2017 GLS 450 is doing the same thing. Slight/Soft grinding sound, only under acceleration at lower RPMs - doesn't matter which gear.

It's not the turbo wastegate loose as when the car is not in gear, revving the engine does not produce the same sound.

Driving me crazy!
Took it to the dealership as this was under extended warranty from when I bought CPO. It was the transfer case and it will be replaced under the warranty. Don't know the exact specifics but will post an update once I hear back from dealership.
Old 06-20-2024, 11:02 PM
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I had to do both the transfer case chain & rear wheel bearings. Both were pretty easy jobs. Transfer case chain & most all bearings can be done without removing the case. I just changed the chain about 100k miles ago, no bearings. Cobra transmission in FL has a complete rebuild kit for it.
Old 07-19-2024, 12:05 AM
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2017 GLS 450
Dealership replaced transfer case and small sound continued. Ended up being drive shaft (propeller shaft). They replaced this too and the sound has now gone away.
Old 07-20-2024, 10:11 AM
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Originally Posted by x166gls
Dealership replaced transfer case and small sound continued. Ended up being drive shaft (propeller shaft). They replaced this too and the sound has now gone away.
By chance do you have a picture or part number for the drive shaft?
Old 07-20-2024, 10:30 AM
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Originally Posted by vesiadog
By chance do you have a picture or part number for the drive shaft?

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Old 07-20-2024, 12:06 PM
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Originally Posted by x166gls
Dealership replaced transfer case and small sound continued. Ended up being drive shaft (propeller shaft). They replaced this too and the sound has now gone away.
Nothing like a dealership that throws parts at a problem. Anyone can do that - I expect better.
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Old 08-02-2024, 08:27 AM
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07 C280 4matic, 2014 GL450, 91 VW Vanagon
2014 GL 450 - 137K miles, I also have a whine. Had a rear wheel bearing replaced a couple months ago. This is a more a high pitched/higher speed whine. Repair shop suspects pinion bearing. Does this sound plausable? Transfer case chain????? General thoughts please.

Bob C
Old 08-03-2024, 09:19 AM
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Originally Posted by acetaylor
2014 GL 450 - 137K miles, I also have a whine. Had a rear wheel bearing replaced a couple months ago. This is a more a high pitched/higher speed whine. Repair shop suspects pinion bearing. Does this sound plausable? Transfer case chain????? General thoughts please.

Bob C
Any specific brand for the rear wheel bearing? OEM or Lemforder? Where purchased if online?
Service sheet for torque specs and any special tools needed? Thanks.
Old 08-03-2024, 12:01 PM
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wheel bearings

Originally Posted by L&N Caravan
Any specific brand for the rear wheel bearing? OEM or Lemforder? Where purchased if online?
Service sheet for torque specs and any special tools needed? Thanks.
Watch some videos first. I have done a few sets. A press is a must plus all the different size pieces to push out and in the bearings. Rears are a little harder because of the brake cables.
https://mbworld.org/forums/m-class-w164/636264-wheel-bearing-w164.html


Last edited by vesiadog; 08-03-2024 at 12:02 PM.
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