How to diagnose a Quattro clunk...
 

Before you get a chance to get it over a pit? A small'ish clunk.

I guess the gearbox mounts are done and will be changed, but there is a small annoying clunk from the back end. Not so much a diff. clunk but maybe diff mounts or control arms maybe. You can feel it if you reverse after having been driving forwards, or vice versa. Almost like you would if you had loose leaf spring to axle bolts, if you know what I mean.

It's this allroad, havent had a look yet but getting under five tons of car lying in mud is not my cup of tea this weekend at least, just spent the last two days fekin about with aged HP-2 calipers... Which are now not seized..:grr::D

What's the most common clunk? Apart from the 'need a new diff' clunk?:eek::tup: I'll find the bu**er one day.

Rear diffs are an issue at high mileage as you have eluded to already and also the transfer boxes are prone to giving up as well. Check your propshaft for worn UJ's too. :tup:

Diff mounts usually

Rear diff mounts. If you get someone pulling forward and backwards and let someone lie along aside the car, you'll see the diff jolting back and forward in the mounts.

Just open the boot, remove jack, lift up one rear wheel and check free play in diff, of course, before releasing handbrake and putting it in gear. Also possibilities are diff mounts as mentioned, and my car also has free play in one propshaft CV joint, which I'll have to replace in future.

Cool, another option! I'll have a look next weekend maybe.:tup:

Quite like the UJ clunk I had on the van, but we'll see, feels like diff. mounts. A sub-100k mile car at the moment, 94k I think, so the diff. itself is hopefully still ok. :can't find a praying smiley::)

I've a similar clunk from the front of mine: just goes thunk when you change direction, like reversing out of the drive then go forwards.

I've managed to convince myself it's the springs on the mounts in the legs, as there is nothing loose (I have kept checking over the last 2 years and MOT's!) and I'm running rear springs on the front to carry the weight.

Could it be some nasty after market springs that don't quite fit in the cups, or the end of the road spring coil snapped off?

On my last three quattros I've never found any play in the rear diff. I've always found it to be worn inner cv joints.

With the rear jacked up turn the prop left to right by hand. You'll see the drive flanges move immediately but the shafts stay still. Hope this helps and is the same problem as your, cheap fix if so

Thanks guys, will take a look this weekend.:tup:

Well it a bit of everything...:wall::lol:

Spot on with the worn inner C.V. joints!:tup: One of them is worse, one not much play, but a tiny bit there.

Play in the middle universal joint, can't get to the front one because of heat shields at the moment, but the whole lot will be coming off, exhaust and all, to get to the middle one, so may as well do the front one too.

Some play in the diff... which at some point has been leaking oil, and appears to have stopped leaking! Never a good thing.....:shake::lol:

So pretty much the whole drivetrain is coming off:lol: might do all the C.V. joints.

Found a heat shield missing from a cat, right next to the clutch slave cylinder by the look of it... Another job.

(Only went up to the garage to get under a roof to take a door card off! To see why the driver's window motor or regulator has spontaneously shredded itself, and the pit was free, so I used it)

The most surprising thing of all, the rust! Much worse than any of the type 44s, which are twice the age, much worse! The galvanising process must have gone down the tubes in the early nineties.

Last post 1992 audi ever, never again, they're crap!:lol: