Replacing 2 Flex discs 85 300SD any pointers
 

It looks pretty straight forward and I did look at some threads here. This is what I came away with mainly common sense items.
1. Mark both halves of the driveshaft where they come together.
2. The manufacturers markings on the rubber portion should face forward ?

I am also replacing the center support bearing. Thoughts ?
Thanks
Alan

Answer
 

Bad flex disk driving home
Bad flex disk driving home - PeachParts Mercedes ShopForum

Bad Flex Disc
Bad Flex Disc - PeachParts Mercedes ShopForum

Weekend Wrenching (a great picture of a bad flex disc)
Weekend Wrenching - PeachParts Mercedes ShopForum

The Death of a Flex Disc ... did I kill my 240D?
The Death of a Flex Disc ... did I kill my 240D? - PeachParts Mercedes ShopForum

What happens when you ignore that "little" driveline vibration!
What happens when you ignore that "little" driveline vibration! - PeachParts Mercedes ShopForum

Flex Disc Orientation, safety and durability issue.
Flex Disc Orientation, safety and durability issue. - PeachParts Mercedes ShopForum

If your W123 is shaking down the highway. . .
If your W123 is shaking down the highway. . . - PeachParts Mercedes ShopForum

Correct way to install front driveshaft guibo? (FLEX DISC)
Correct way to install front driveshaft guibo? - PeachParts Mercedes ShopForum

Do you have the right puller to withdraw the center bearing?
If you drop the diff a few inches the drive shaft will slide past the alignment center without using a pry bar. Place a floor jack under the diff, undo the four bolts going into the cross frame, real easy. Lower six inches. First remove the tunnel pan.
Enjoy the job.

Center support bearing
 

W126_Rubber Boot_drive shaft center support bearing
W126_Rubber Boot_drive shaft center support bearing - PeachParts Mercedes ShopForum

W126 drive shaft carrier/center bearing DIY
W126 drive shaft carrier/center bearing DIY - PeachParts Mercedes ShopForum

Thanks , As always excellent information. I will get started Sunday a.m. but then need to take the kids to Moms around noon. Plus I need to trouble shoot an issue I posted in another thread about power loss. I believe it is a throttle linkage issue.
Thanks
Alan