Semi-vague rear diff mount install :) sBWW

Nick Gustas · 12-08-2003, 05:39 PM

You'll need

T50 torx
T45 torx
VAG1359/2 universal support :P

PN: 8A0599133B at minimum, replacing all bolts is a good idea too.

Overview of area, this will serve as before and after pic. Clean aluminum thing is the culprit today.

To begin, remove 4 bolts on aluminum crossmember, two are by exhaust and hold exhaust hanger. Exhausts other than borla may require removal. YMMV.

Removed crossmember, this and mount are amazingly light.

With crossmember out of the way, remove four bolts holding mount to diff.

Naked bottom of diff to give an idea of where the bolts in the previous pic are.

Reason to watch knuckles is that pesky gas tank strap. It's dull, I knew it was right there, but the first bolt caught me off guard anyway when it broke loose. Good thing it was cold out, didn't hurt a bit. Got blood all over though. Lot more blood when I went inside and unfroze my fingers.

Old and new, side by side. No significant visible damage to old mount, but it was not as stiff as the new one.

Old mount in the distant past would allow diff to rub and make scraping noise under first gear accel. Would also bang occasionally under sudden driveline load. Here is the mark.

I cleaned the area and reundercoated the mark, all I had was 3m black rubberized so it doesn't match. If you need to do this make sure you cover the diff flange so excess undercoating spray doesn't knock it out of balance.

Side overview.

Torques as best as I could decipher from bent lee.

40NM long bolts through crossmember to body.
23NM exhaust mount bolts to body.
50NM mount to diff.

Important!
When reassembling, use a jack or similar AOA approved device to lift the diff and exhaust to the proper height. DO NOT pull them into place using the bolts, they may strip out if you are unlucky.

Hopefully this will fix my occasional rear diff clunk during driveline load. Didn't test at all because I want to give the undercoating time to cure, don't want any glops knocking the diff out of balance.

Imolavirus@BuehnEngineering · 12-08-2003, 05:43 PM

Nick Gustas · 12-08-2003, 05:48 PM

and another car too. Wasn't worth the effort for a job that was only a pair of ramps plus 8 bolts.

DocSlow (Mini Pig) · 12-08-2003, 06:01 PM

donp · 12-08-2003, 06:18 PM

Nick Gustas · 12-08-2003, 06:47 PM

I can find the exact smaller torx size too, mail me if I don't update tomorrow. If someone included it in an exhaust install it's probably that size

Also, the four diff to mount bolts are actually allens, but the T50 for the long crossmemeber to body bolts fit perfectly.

DAP@EPL · 12-08-2003, 07:07 PM

The dealership replaced mine so I didn't have a chance to compare the old one and the new one.

-Dave Pramanik

Nick Gustas · 12-08-2003, 07:27 PM

Nick Gustas · 12-08-2003, 07:28 PM

flame monkey@PEBFATS · 12-09-2003, 09:58 AM

12-08-2003, 05:39 PM	#1
Nick Gustas Senior Member Garage is empty, add now Join Date: Mar 2000 Posts: 7,469	Semi-vague rear diff mount install :) sBWW You'll need T50 torx T45 torx VAG1359/2 universal support :P PN: 8A0599133B at minimum, replacing all bolts is a good idea too. Overview of area, this will serve as before and after pic. Clean aluminum thing is the culprit today. To begin, remove 4 bolts on aluminum crossmember, two are by exhaust and hold exhaust hanger. Exhausts other than borla may require removal. YMMV. Removed crossmember, this and mount are amazingly light. With crossmember out of the way, remove four bolts holding mount to diff. Naked bottom of diff to give an idea of where the bolts in the previous pic are. Reason to watch knuckles is that pesky gas tank strap. It's dull, I knew it was right there, but the first bolt caught me off guard anyway when it broke loose. Good thing it was cold out, didn't hurt a bit. Got blood all over though. Lot more blood when I went inside and unfroze my fingers. Old and new, side by side. No significant visible damage to old mount, but it was not as stiff as the new one. Old mount in the distant past would allow diff to rub and make scraping noise under first gear accel. Would also bang occasionally under sudden driveline load. Here is the mark. I cleaned the area and reundercoated the mark, all I had was 3m black rubberized so it doesn't match. If you need to do this make sure you cover the diff flange so excess undercoating spray doesn't knock it out of balance. Side overview. Torques as best as I could decipher from bent lee. 40NM long bolts through crossmember to body. 23NM exhaust mount bolts to body. 50NM mount to diff. Important! When reassembling, use a jack or similar AOA approved device to lift the diff and exhaust to the proper height. DO NOT pull them into place using the bolts, they may strip out if you are unlucky. Hopefully this will fix my occasional rear diff clunk during driveline load. Didn't test at all because I want to give the undercoating time to cure, don't want any glops knocking the diff out of balance.

12-08-2003, 05:43 PM	#2
Imolavirus@BuehnEngineering AudiWorld Super User Garage is empty, add now Join Date: Mar 2002 Posts: 17,943	ouch, working on gravel? __________________ -Jacob ^^^CLICK SIG FOR BUEHN ENGINEERING WEBSITE^^^ <big><big>Website Here!!!</big></big> <big>Items For Sale</big>

12-08-2003, 05:48 PM	#3
Nick Gustas Senior Member Garage is empty, add now Join Date: Mar 2000 Posts: 7,469	Yeah, have garage space, but it was easier to throw down a MDF sheet for this than move a trailer. and another car too. Wasn't worth the effort for a job that was only a pair of ramps plus 8 bolts.

12-08-2003, 06:01 PM	#4
DocSlow (Mini Pig) Elder Member Garage is empty, add now Join Date: Feb 2003 Posts: 12,797	That clunk scared the sh!t outta me the first time I was in your car. Good to hear it might be gone!

12-08-2003, 06:18 PM	#5
donp AudiWorld Super User Garage is empty, add now Join Date: Nov 2000 Posts: 11,085	Good info. Mind if I put it in the tech section? __________________ National Sarcasm Society (like we need your support)

12-08-2003, 06:47 PM	#6
Nick Gustas Senior Member Garage is empty, add now Join Date: Mar 2000 Posts: 7,469	Sure, feel free to clean it up if it need be. I can find the exact smaller torx size too, mail me if I don't update tomorrow. If someone included it in an exhaust install it's probably that size Also, the four diff to mount bolts are actually allens, but the T50 for the long crossmemeber to body bolts fit perfectly.

12-08-2003, 07:07 PM	#7
DAP@EPL Audiworld Sponsor Garage is empty, add now Join Date: Jun 2000 Posts: 19,700	Nice! Was the part revised? The dealership replaced mine so I didn't have a chance to compare the old one and the new one. -Dave Pramanik __________________

12-08-2003, 07:27 PM	#8
Nick Gustas Senior Member Garage is empty, add now Join Date: Mar 2000 Posts: 7,469	Not much visual difference. Same part number. Rubber seemed thicker, maybe the mold is wearing out?

12-08-2003, 07:28 PM	#9
Nick Gustas Senior Member Garage is empty, add now Join Date: Mar 2000 Posts: 7,469	T45 torx, editing post and adding a bit more info now.

12-09-2003, 09:58 AM	#10
flame monkey@PEBFATS Junior Member Garage is empty, add now Join Date: Sep 2002 Posts: 802	sweet man. __________________ DOCSLOWNOMOW. don't be a wusspod and instasplode (from the mike2ks4 dictionary) sig courtesy of the bollox, master smack-sig creator.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode


Discussion Forums:

12-09-2003, 09:58 AM
AudiWorld Audi R8 Paid Advertisement