V8 Quattro Axle Woes

26 Beiträge · 13.423 Aufrufe · gestartet

#1
Hi everyone,

I recently took my 1990 3.6L V8 Quattro in for a complete mechanical inspection and had a list made of all issues the mechanics found. The two worst problems are that the transmission is stuck in electrical limp mode (which I'll tackle on another thread later) and that the front axle is badly corroded and apparently needs replacing.

Noticeably, the front left outer CV boot is torn open and the joint is incredibly loud on right turns, to the point that the mechanics have warned me that the CV will fail soon and possibly jam. However, when I asked about getting the axle or CV replaced, I was told that the 1990 V8Q's use a unique axle that is long out of production, and that the only option would be to find an identical donor car to use for parts, or simply, that I should scrap the car and move on.

That said, another friend with a V8Q told me the axle of the C4 series Audi 100/A6 was the same, and that it could be directly swapped. Is this true? How about just replacing the CV joint with a C4 series part?

It's worth noting that my UFO brakes have been swapped for G60's.

Thanks in advance for your advice!
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#3
Hi Tim,

I'm not an expert, but I believe it would be part number 441407271M (14A) on the diagram you sent me.

After some late-night searching on Google, I also think I found the elusive CV joint which is discontinued in North America: Is this the one?
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#4
Hi Jordan,

I can try to find the matching part numbers for you. But I need your VIN and the gear box ID letters for that. You may transmit it with a private message or eMail
(click my Name and you'll find the opportunities)

The driveshaft 441407271M is available in Germany (aftermarket stores). The joint of your link is an inner drive shaft joint. I guess it will not solve your problems. And I'm not sure whether it would fit to your car.

What is your location?

Regards
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#5
I'll check my VIN number when I get off work in a few hours. Where would I find the transmission code numbers?

I'm located in Victoria, British Columbia, Canada.

Thanks!
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#7
You mean because the outer CVs are all the same?

I've been wonderering why you requested the gear box ID

The inside CV's are not the same at all... the front ones are till beginning 1991 108mm adapter (Rzeppa), later they are 100mm (Tripode).
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#8
Hi Tim, Roy,

My VIN # is WAUKE544XLN010723.

Regarding the front axle; the mechanic told me to replace the whole thing, but these aren't easy to find in Canada anymore. I'd like to rectify the "clicking" noise I'm getting turning sharp right, as well as replace the lower control arms (as I'm experiencing bad bump-steer when I hit uneven pavement).

Roy, looking at your smugmug profile, I see you've had transmission problems in the past? Did you manage to fix yours?

Thanks for all the help gentlemen
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#9
I'm rather cynical when it comes to the majority of garages, repair shops, etc. I get the impression that many are really just component fitters, and lack the skill for proper repairs.
Finding a complete, new shaft at sensible price may be difficult or impossible. Fitting a used one may leave you open to the same problems soon.

Find a local driveshaft specialist, and see what they say.

Bearbeitet von Mark

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#10
In Antwort auf:

Roy, looking at your smugmug profile, I see you've had transmission problems in the past?




There are no pics about transmission and its problems...

?

Well... last year I crushed my 2nd V8, so I get a other one (for Winter and for the case I do some maintenance on the 1st V8)... pretty low price BUT the transmission has been cracked somehow - reverse okay, but no way to drive forward, so I think it's the clutch A in the gear box which it's cracked.
The scary thing is, there are no chips in the ATF or its filter at all... maybe the last owner changed it by trying to repair it...

So I will replace the whole thing - yesterday I saw, that my replacements are all the newer transmissions (I have 2 of them) then the one in der car... f**k!

Lucky I am, I found 2 axels with the newer adapter (the one with 100mm Tripod) in my storage.

I hope that will be the only difference... today I go to concreting my new stairs, maybe later or tomorow I will see more... just a bunch of screws need to be removed.
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#11
Clicking noise at turns, according to driving speed is definitely generated by worn outer drive shaft joints. If inner joints are worn, they generate vibrations but no clicking noise.
The outer joints are not a big deal to replace.

But I'm with Mark. You need an experienced mechanic for proper diagnostics and fittings. Bad bump-steer may of course be caused by worn bushings and ball joints but also by worn shock absorbers.

I'll try to be back with some part numbers.
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#12
The matching part numbers for outer joints are: 4A0 498 099 and 4A0 498 099D
They fit to different 100, A6 and V8
This joints are easily available in Germany if you can't them in Canada or the USA
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#13
In reply to:

There are no pics about transmission and its problems...

?




Sorry. I saw a photo here that showed your transmission display in "PRND321" so I assumed you had experienced the dreaded "limp mode" in one form or another...

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#14
In reply to:


The matching part numbers for outer joints are: 4A0 498 099 and 4A0 498 099D
They fit to different 100, A6 and V8
This joints are easily available in Germany if you can't them in Canada or the USA




Wow, these look exactly like what I need! I will speak to my mechanic about having a pair installed. I just have to wait for a few more paydays to come: another repair has suddenly taken priority - my radiator line blew a couple of days ago
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