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Rear Driveshaft Flex-Disc Replacement
 
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Pelican Technical Article:

Rear Driveshaft Flex-Disc Replacement

Nick Czerula

Time:

1 hours1 hrs

Tab:

$200

Talent:

*****

Tools:

T60 Torx, 18mm wrench, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Mercedes-Benz E320 (2003-09)
Mercedes-Benz E500 (2003-06)
Mercedes-Benz E55 AMG (2003-06)

Parts Required:

Driveshaft flex-disc, Driveshaft flex-disc fasteners

Hot Tip:

Work with a cool engine and allow exhaust to cool before beginning

Performance Gain:

Smooth drivetrain

Complementary Modification:

Replace front flex-disc

A Giubo, also known as a driveshaft flex-disc, and frequently misspelled as guibo, is a flexible coupling used to transmit rotational torque between the drive shaft and the transmission or the rear differential.

The Giubo is made from flexible rubber and is designed to allow some angular misalignment while reducing driveline vibrations. Input and output shaft flanges are bolted to the Giubo on either side using alternating hole positions, so the flanges are not connected directly to one another but instead only through the insulating rubber material of the coupling. The elasticity of the rubber absorbs vibration and flexes for alignment.

Since it is made of solid rubber it dries out and wears over time. You may experience a drivetrain vibration or shimmy. If so, inspect your driveshaft flex-disc. It should be free from distortion, cracks and tears, and have no missing pieces. If you find any of these problems, replace the driveshaft flex-disc and mounting fasteners. To access the driveshaft flex-disc, you have to remove the exhaust system or lower it about 8 inches. When replacing, at the minimum, replace the self-locking nuts that attach the driveshaft flex-disc. I prefer to replace the bolts too. The driveshaft flex-disc is also referred to as the Giubo.

In this tech article, I will show you how to replace the rear flex-disc without removing the exhaust or driveshaft.

Raise and support the rear of the vehicle on jack stands. See our tech article on jacking up your vehicle.

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The flex-disc (red arrow) connects the driveshaft to the rear differential (yellow arrow).
Figure 1

The flex-disc (red arrow) connects the driveshaft to the rear differential (yellow arrow).

The yellow arrows point to marks I made on the driveshaft and differential flange.
Figure 2

The yellow arrows point to marks I made on the driveshaft and differential flange. Before removing, note the position and be sure to install the replacement flex-disc with the driveshaft and differential flange in the same position.

Working at the Giubo, remove the three driveshaft bolts (red arrows).
Figure 3

Working at the Giubo, remove the three driveshaft bolts (red arrows). Use a T60 Torx bit and an 18mm wrench. Hold the Torx head still as you loosen the 18mm nut (green arrow). This will prevent accidental stripping of the Torx head.

When removing the fasteners, note the washer positions.
Figure 4

When removing the fasteners, note the washer positions. The driveshaft side washers go on the nut or side (yellow arrow). The differential flange washers go on the bolt side (red arrow).

With the driveshaft fasteners removed, use a pry bar to lever the driveshaft (red arrow) out of the flex-disc aligning tab (yellow arrow).
Figure 5

With the driveshaft fasteners removed, use a pry bar to lever the driveshaft (red arrow) out of the flex-disc aligning tab (yellow arrow). The alignment tabs are round and sit in a recess in the flange and driveshaft. The tabs tend to get a bit rusty in my area, so I leave the differential bolts in place (green arrow), until I detach the driveshaft from the Giubo. Once free, remove the differential fasteners the same way you did the driveshaft fasteners.

With all the fasteners removed, use a pry bar to lever the Giubo (red arrow) out of the differential flange (green arrow).
Figure 6

With all the fasteners removed, use a pry bar to lever the Giubo (red arrow) out of the differential flange (green arrow). 

Use your pry bar, lever the driveshaft out, then down out of the differential flange.
Figure 7

Use your pry bar, lever the driveshaft out, then down out of the differential flange. Then pull the Giubo down and away from the differential to remove it.

With the driveshaft moved aside (red arrow), install the new Giubo.
Figure 8

With the driveshaft moved aside (red arrow), install the new Giubo. Align the tabs with the flange. Then tap it into the flange. Once in place, install the driveshaft and tighten the fasteners.

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Comments and Suggestions:
Cliff Comments: If I don't have the torque specs and I tighten as much as I can and tighten bolts evenly and symmetrically should that be ok? Am I right in thinking the exhaust HAS to come out/down or no?
October 26, 2016
  Followup from the Pelican Staff: No, they should be torqued to the correct amount. you could over-tighten and break something. - Nick at Pelican Parts  
E 55 AMG V8 KOMPRESSOR Comments: Figure 5 & Figure 6 contradict each other, or did you move it back down into the sleve again I dont get it on figoure 5 use a pry bar to lever the driveshaft red arrow out of the flex-disc aligning tab
but on figure 6 it is back into position again???..

Did this today on my W211 E 55 damn the sleve is long and the Shaft need to be pushed very far forward towards front to go free to be able to pull the flex disc out, anyway my flex disc wasn't that bad so ended up putting it all back together next time I buy a larger Pry Bar mine is to skinny that was my problem the Guide is really good...
and hey the clonk noise is gone after I put it all back together no idea what and why but had a loud Clonk when from full stop hit the gas hard so loud people was looking :
thats all gone now very strange since I didnt replace anything, but perhaps something was not engaged proberly who knows I am so thrilled for this guide as AMG center adviced replacing Chassis bushings HUUH..
November 27, 2015
  Followup from the Pelican Staff: 5 shows the driveshaft being levered out of the disc. Then 6 shows the disc being levered out of the diff.

If you have a clunk, something is loose. Check the fasteners. - Nick at Pelican Parts
 
martin Comments: What are the symptoms. Can clonk when start stop be caused by a worn flexible joint disc?
October 26, 2015
  Followup from the Pelican Staff: Yes, or something in the rear end. - Nick at Pelican Parts  
E 55 AMG V8 KOMPRESSOR Comments: According to WIS
Selfe-loking nut, fkexible coupling to rear propeller shaft or rear axle center assembly M10 = 40Nm
M12 = 60Nm
This for
W211
W211
W220
W230
October 26, 2015
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 
Kev Comments: What are the torques for the flex and drive shaft bolts?
August 19, 2015
  Followup from the Pelican Staff: I don't have that info.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 

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