GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Chirping noise from transfer case/transmission when in P

Old Jan 9, 2024 | 07:51 AM
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2007 GL450
Chirping noise from transfer case/transmission when in P

There is a chirping noise from the transfer case/ transmission area when my GL450 is in P, the noise goes away if shifting the transmission to R or D.
I've also noticed oil leak around bottom of transfer case, wonder if they are related.


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Old Jan 9, 2024 | 03:14 PM
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NGL450 w/EORP, S550
Will the car roll with Park engaged?
don’t do stupid things trying to test that out. Be safe.
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Old Jan 10, 2024 | 07:21 AM
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Originally Posted by Max Blast
Will the car roll with Park engaged?
don’t do stupid things trying to test that out. Be safe.
It will not roll when transmission is in P
Friend told me the leak might be due to pinion seal, and it is costly to replace the seal. maybe for now I'll just regularly fill up the transfer case fluid?
He also said the noise could be due to old transmission mount.
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Old Jan 10, 2024 | 10:34 AM
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Yeah check the fluid level.

The transmission mount is such a simple replacement, give it a try.

Do a bit more thorough characterization of the problem, too. Check to see if it is rpm dependent, that sort of thing.

In general, those superficial noises are not a great concern.
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Old Jan 10, 2024 | 11:03 AM
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thanks will look into the transmission mount replacement. I've bought a new transmission mount long time ago.
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Old Jan 10, 2024 | 11:20 AM
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did not find any post for replacing transmission mount of x164, but found one for x166, probably very similar work procedure.
https://mbworld.org/forums/gl-class-...6-v8-m278.html
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Old Jan 10, 2024 | 12:55 PM
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Originally Posted by texas008
did not find any post for replacing transmission mount of x164, but found one for x166, probably very similar work procedure.
https://mbworld.org/forums/gl-class-...6-v8-m278.html
I recall skimming the procedure, probably in WIS, and summarizing it as: Support the transmission with a jack; unbolt the crossmember, unbolt the mount. Reverse to replace.
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