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Old 09-20-2010, 04:07 AM
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Join Date: Feb 2002
Location: Bulgaria, Sofia
Posts: 584
Perhaps this might be the solution to the u joint problem.

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190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)
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Old 10-13-2015, 03:15 PM
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,150
That might be beneficial for protection of the flex disc from roadway damage but I don't see how it would help the u-joint.
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Old 10-13-2015, 04:14 PM
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Join Date: Jun 2010
Location: Green Bay, WI
Posts: 1,341
^ Ditto. Unneeded protection. But by the vary nature it flexes, hence the name. This would not stop that and you would not want it to.

The only u-joint problem I am aware of would be people installing inferior brands. Is there another that calls for this?
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
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Old 10-18-2015, 07:10 PM
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Join Date: Jan 2012
Posts: 7,146
These cups stiffen the rubber flex joint for high power applications so it does not tear out. And it looks like a safety mechanism to prevent the disc from allowing the drive shaft to become decoupled if the disc fails.

Over in BMW / Caddy CTS land, they are using an aluminum disc with individual poly bushings, not sure how well it works.
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