Transmission slack?

[newsh]

I'm getting quite a loud clunk as I let out the clutch from a standstill. I think its worse coming from reverse to first, to avoid it I have to let out the clutch really gently and sometimes even this will not help. With the windows open the sound is almost a clang. I'm pretty sure its from the rear of the car. I've just replaced the rear diff mount with the Powerflex item so its not that.. Any ideas welcome. Could it be the prop shaft? Or the rear diff?

[porkkis]

I have loads of slack. I have renewed the rear diff mounts and the rear mount is the PU one.
I think that it's the rear diff itself. And as it does not scream it's probably not the bearings but rather the pinion teeth have worn.
If you mean your S2 and not the Urq the best solution is probably to buy a second hand one from a NG or 7A or some other 5cyl N/A t89q as they all use the same ratio and internals. Only the CV joint flanges change, but you can use your old ones.

This is what I'm going to do. My friend has s A90Q with 133hp NG engine and there is 275k km on the clock and absolutely no slack. It's easy to figure out that the "normal models" don't make the power train to suffer...

Btw the A90 is been built to be a E/S2 at the moment with AAN engine and with unmodified AAN IM! The rad is a bit tight fit
I can post pics later if our American cousins are interested about the project. Also the battery carrier stays in the engine bay.

[newsh]

Yeah, the S2, I think its the diff too, actually the powerflex diff bush has made the slack more obvious as it olds the diff more rigidly, good idea to get a diff from an NA car, I'll keep an eye out for one. Could it be there is also some slack in the prop shaft ends and centre joint? Seems like you hear the noise in the shaft, that's why it sounds like a "tang"..

[porkkis]

If the sound is a "pling" then it's one of the prop shaft CV joints. Probably the front one.
Slack in center joint adds a bit of noise too.

I have new centre joint and "new" second hand front joint and the rear was good. It must be the diff.

[s2driveruk]

I have exactly the same symtoms after changing to the Powerflex rear diff mount, the clunk is much more pronounced and also there is quite a bit more vibration at very low revs, say pulling through 2nd gear before the turbo comes in you can feel quite a bit of rumble. I tried to rotate the propshaft and there is a good portion of movement before it (i guess) engages with the next tooth on the diff or the next spline on the prop which i guess is giving the clunk. I'm also getting a wub wub wub noise at about 40mph which has been around for ages (Audi said forget about it its nothing to worry about) but I can't help thinking that a bearing or something is on the way out and what mess it would do at 80mph if it let go.

Any ideas?

David

[SteveH]

This 'clunk' from the running gear is common on higher mileage quattros. On my car it's mainly in the rear diff, however, the propshaft to torsen joint also appears to have a bit of lash in it too. Short of replacing the whole rear running gear with new items, I think it's something you'll have to live with.

[s2driveruk]

yeah and much cheaper too huh cheers Steve...

David

[Allybingo]

Yeh mine too its driving me mad! At first people said it would be the gear box mountings, it wont let me change gear smoothly especially 1st to 2nd, it needs to done as it makes the car a real pain in the **** to drive!

[Greg_S]

AFAIK thats a bit of an S2 trait. Mine is difficult normally and even worse when cold. Been wondering how to improve it so probably start with replacing all the mounts and bushes.

Greg

[NoNonsense]

a stiffer snub mount up front will transmit all the slack to your tranny mounts, and if those are fooked, then you'll have a hard time shifting. When I ordered my powerflex snub mount, i also replaced the tranny bushings with OEM ones at the same time.

[s2driveruk]

how easy is it to change the gearbox mounts....?

[NoNonsense]

I lack jack stands or a lift, so I had my mechanic do it and he charged me for an hour of labor...but, he's a retired rally mechanic, so it might take other mechanics a little longer.

[Fat Audi 80]

I get a Twannnng noise when I first pull away and completely disengage the clutch. It only happens when you first pull away after the car has been standing, not in traffic. Is this the noise people are referring too or do I have some other strange symptom?

[porkkis]

Haha! I received my N/A model rear diff today! It feels absolutely great! No slack! Wu-huu

As a remark would be probably good to mention that it is not yet bolted on, but there's a distinct difference when turning it by hand compared to the one that's in the car.

[GeorgeS2UK]

Haha! I received my N/A model rear diff today! It feels absolutely great! No slack! Wu-huu

As a remark would be probably good to mention that it is not yet bolted on, but there's a distinct difference when turning it by hand compared to the one that's in the car.

How did you get on with the N/A model rear diff replacement? did it cure your problem as I seem to have the same issues?

PS... N/A model ?????? excuse my ignorance

George
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