944sA6

I have a 2007 A6 quattro 3.2l 6 sp auto US market vehicle and my indy mechanic just informed me that the differential just blew! If i get a used one how do i know if the ratio is the same as the one in there since it is quattro and it would not be good if it was different?

I can not see myself paying about $3,000 plus labor for a new one from Audi, but do not want to spend money on labor for the install and have the wrong one.

I have had other Audis, quattros and they had no drive train problems even after 200K miles and this one only has 114K.

Any help would be appreciated.

Thanks!

4Driver4

Which diff (you have three)?
I have a 2005 A6 that I am parting. I might be able to help.

eazy211187

Check where the spare tire is at, there should be a label with codes. Something like this.


Look for a code like one of the following: HCC, HNL, HUP - this for the rear differential.
But like 4Driver4 said which differential?

Mr. Bizzle

Do you still have the tail lights, and if so, are they the ones with the L.E.D.'s?

944sA6

It is the Rear one.

Does anyone know if this TSB applies to my vehicle:

http://uberlame.com/a6_tsb/Transmission/Whining noises from rear axle.pdf

can't get the hyperlink to work above this is the name of the TSB:

Whining noises from rear axle (01R)
39 08 03 2017932/1 June 12, 2008

944sA6

my car is at the indy shop right now, but when i called the Audi dealer, and after giving them my VIN they said i have the HCC code for my rear diff, however the Sticker in the trunk and the diff says HUP, so they did not have accurate info. Hope this helps.

Also how many miles are on the diff you have?

944sA6

Rear. How many miles does yours have on it? what code is it? HUP or HCC or another?

4Driver4

Trunk sticker says HCC.
Tail lights are LED

I detest the IM feature. If anyone needs anything off this car, email me please:
4driver4(AT)gmail(DOT)com

944sA6

Thanks, but i have a HUP diff. Checking the junk yards, got one in but sent me the wrong one, and everyone is trying to sell me the same type i got wrong so will need to get pics before they send me one from now on.

eazy211187

There Interchangeable, there both 3.10 ratio

HUP should be the updated version from 2007-08
HCC should be from 2005-08

Here's HUP on ebay:
Audi A4 B7 Cabriolet 2 0 Rear Axle Diff Differential Code HUP | eBay