Fwd: Driveline problems 90q

[jesper moreau]

I'm not sure how long you have been a member of the list and what
problems with audis you are familiar with but all I can do is tell you
my personal experience with similar problems.

"Now I'm picking up some scary noises as well.  When the
drivetrain has reverse torque, i.e. when in reverse or under engine
braking, I get a substantial 'ring' that seems to happen once every
driveshaft rotation."

it sounds like a carrier bearing gone bad, also, while you're under
the car check for any play in the fore and aft CV's. My aft drive
shaft CV had substantial play and made all kinds of noises. I have
found the universal joint located right after the carrier bearing to
commonly be in decent condition on most older audis. Def. check the
carrier though AND when was the last time you changed the tranny and
rear diff oil?..... i'd be curious to see the condition of what comes
out.

"In addition I have a new knock that
comes from the rear end at low speed, under 15 mph, again while under
engine braking like when coming to a stop.  I haven't been able to
duplicate the knock by driving in reverse, and the knock only seems to show
up after driving for 15 mins or so."

2 things in my experience create this noise. 1. bad bushings on the
trailing arms - there are kits out there at reasonable prices that
will take care of the clunking rear-end.
2. not sure but I think the '89 90 also has the rear transverse link
also (like a control arm on the top side of the knuckle) I have had
these go bad on both of my 5KTQ's. If you lift the rear end and lift
up and shake the wheel up and down, you'll know if it went. you'll
get..... clunk clunk clunking.

well I hope this helps. AND I hope it isn't your actual read diff
making the noises!!
Good luck

Jesper Moreau
'88 5KTQ rocket
'86 5KTQ stocket

On Mon, 3 Jan 2005 09:31:01 -0500, David.Payne at brinksinc.com
<David.Payne at brinksinc.com> wrote:
> OK guys, this is starting to get serious.  I've had some drivetrain lash
> problems with this car ('89 90q) since I've owned in (just over a year,
> about 12k miles).  Now I'm picking up some scary noises as well.  When the
> drivetrain has reverse torque, i.e. when in reverse or under engine
> braking, I get a substantial 'ring' that seems to happen once every
> driveshaft rotation.  The best that I can tell, the noise is coming from
> the tail housing of the gearbox, right where the torsen lives.  I plan on
> getting under the car tonight and putting a load on it in reverse and see
> if I can pinpoint it a little closer.  In addition I have a new knock that
> comes from the rear end at low speed, under 15 mph, again while under
> engine braking like when coming to a stop.  I haven't been able to
> duplicate the knock by driving in reverse, and the knock only seems to show
> up after driving for 15 mins or so.  The knock sounds like the diff is
> trying to divorce itself from the rear subframe, you can hear it and feel
> it.  This car needs new front diff mounts and g-box mounts, but it has
> needed them for a year, it didn't just happen.  Both the g-box and diff
> fluid was changed when I got the car and I check both this weekend and they
> looked OK.  If anyone has any input please let me know, I'd need to get at
> least one more year out of this beast and I have invested to much in
> getting the CIS and suspension sorted out to abandon it.
> Dave.
> 
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