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Discussion Starter #1
History... 153,000 on the OD, well kept no towing Treg. A little vibration and noise warmed up noticeable when windows up and stereo turned off.

Assumed drive shaft bearing and/or flex joint. Went with the vertex bearing support and new flex joint, replacing both within the last 2 weeks.

Fixed the vibration, bearing support was shot BUT the noise is still there.

Inspected all 4 corner brakes and bearings, appear good.

Now onto front/rear differential and transfer case. Purchased fluids from dealer and will meet up with the local mechanic in the morning panning for gold. Fluid part number for diffs are the same with transfer fluid shown in picture.


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Fluids and of course my 4 legged side kick Kadester (American Staffordshire Terrier)

Any recommendations?

More to come...

Marc
 

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Hi and welcome, I made DIY treads about diffs, transfer case, transmission fluid change so see all threads in my profile maybe it will help you :)
 

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Discussion Starter #4
Jesnic, running on newer BfGoodrich road force balanced tires. Measured tread depth in 4 different places as they now have just under 4000 miles on them.

Appear to be fine.

Thanks

Marc
 

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Discussion Starter #5
Nikoloz, I will check out your threads... thanks

Marc
 

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Can you explain the noise? High pitch hum when keeping throttle constant would suggest driveshaft/drivetrain harmonics. Low pitch groan would suggest bearing. Variable pitch with throttle would suggest air intake, vacuum, secondary air pump. Groan and or mild chatter with throttle under load would suggest front diff. Loud popping under throttle load would suggest transfer case.
 

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Discussion Starter #7
Jesnic

Whatever it is must be warm, rotational sound and is speed sensitive but not high revolutions even at 70 m ph. If I were to guess, early warn bearing on a small shaft. I hear it in the cabin only and can't tell front, center, or rear. Is not a high pitch, and is a low pitch with grinding. once really warm I can hear it all the way to a complete stop.

Tough to describe.

Thanks

Marc
 

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Discussion Starter #9
I would be checking wheel bearings again, then driveshaft, then front diff.
Funny you should say that... got the results for front/rear diffs and transfer case. Fluids are clean :).

And the mechanic said it is my passenger side bearing. Gotta love local mechanics, no bull, all 3 fluids changed and a diagnosis for $80 bucks. I purchased fluids from VW, transfer was $26 and diffs $27.83 times 3. I feel good they are done, first time as I was following VWs lifetime direction.

Next question, should I do both front bearings, thinking yes and do I use VW parts or let the mechanic order OEM like bearings?

Thanks again

Marc
 

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I would change the bad one and wait for the other to go bad. Could get another year or more out of it. No reason to change a part that isn't broken.
 

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Discussion Starter #12
Both good advice and appreciate it very much... i am meeting with the mechanic again on Monday to get on his book for service. I will let the dollars speak, if I can get them both done for a reasonable price ~$500, then will do so. If too $$, then I will replace as needed. Heck, he saved me $300 for fluids so far as VW wanted $480. He is local and it is good to help his revenue stream.

I know I can get OEM bearings for about 100.00 per, VW is 172.00 per so I think I will go OEM. I am only looking for another 50 k miles out of this treg then someone else can mod it up for off roading. It will still be in great shape.



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Marc
 

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Discussion Starter #13
Update... replaced passenger side wheel bearing with a FAG wheel bearing kit from parts geek. Did not fix, so I ordered a second bearing kit for drivers side, and is going into local shop on Monday. More to come...

Bearing kit $118+$23 shipping, $200 to install, times TWO. Still reasonable...

Marc
 

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Discussion Starter #14
Update... replaced driver side wheel bearing, did not fix. UNCLE!

Today, i put the Treg into the dealer, spoke to them around 4, stated the mechanic spent a couple hours trying to diagnose then recommended getting VW involved. With VW running the show now, They are focused on the transfer case looking at the drive chain. I was told that VW has been telling the technician what to do with each step.

Already looking at Trans shops to rebuild if they come back saying I need a new transfer case.

Uggggg. ... this has been one good journey. But love the Treg so not giving up.
 

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I can't believe a transfer case chain couldn't be diagnosed long before now. It is a pretty obvious sound. The chain slaps the case under hard acceleration. It is fairly easy to replace the chain, bearings and seals. If the technician can't diagnose a transfer case chain, do not let them work on it!
 

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Discussion Starter #16
The weird thing is I have never experienced a slap noise but only a consistent low grinding noise. The mechanic working on it is the same guy from the time I picked the Treg up new, always had good service so not sure why they feel VW needs to direct the diagnosis unless they plan on paying for it. At t his point I only approved their minimum $110.00 diagnosing fee and know the Treg has been on the lift all day. Will be interesting for sure...

Marc
 

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Typically a low, constant grinding noise is the wheel bearings or front diff. You have ruled out bad bearings by having them replaced. The transfer case chain will be very noticeable on hard acceleration and you will hear the chain slacking and popping over the gears. It will gradually get worse over time until you hear it slapping the case and popping over the teeth on the gears. Transfer case repair is fairy simple and not very expensive to rebuild. Parts are available without having to replace the entire transfer case.
 

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Discussion Starter #18
Typically a low, constant grinding noise is the wheel bearings or front diff. You have ruled out bad bearings by having them replaced. The transfer case chain will be very noticeable on hard acceleration and you will hear the chain slacking and popping over the gears. It will gradually get worse over time until you hear it slapping the case and popping over the teeth on the gears. Transfer case repair is fairy simple and not very expensive to rebuild. Parts are available without having to replace the entire transfer case.
Just found this video.. darn near exactly what I am experiencing.
Watch "Front differential noise" on YouTube
Front differential noise:
Regards, Marc
 

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That video does not sound like a front diff gear whine at all. It sounds more like a bad bearing and bad bushings.
 

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Discussion Starter #20
That video does not sound like a front diff gear whine at all. It sounds more like a bad bearing and bad bushings.
Just picked the treg up from dealership, their diagnosis is transfer case replacement, but not 100 percent sure.($3500). Heading to a Trans specialist to validate the issue. If reasonable will get r fixed and sell it.

Looking at a 2015 lux in the meantime.
 
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