Shaft vibration

[landsea]

Hi all, got a bad drive line vibration. Put my car up on a lift and the front of the drive shaft between the flex and transmission looks a bit far back to me? Is there a nut on the transmission output shaft that may be loose? I am hoping to get some lift time again later this week and pull some things apart. Ghx

[Charles 230SL]

..Is there a nut on the transmission output shaft that may be loose?..

wow! looks like the flange nut has loosened and the three-arm flange is working it's way off the shaft. 

Ghx, I hate to be coarse but I don't think I'd drive the car until that flange is tightened. Is your speedometer erratic or still working?

[landsea]

Yes it appears that way, thank you for those images. This transmission was completely rebuilt by a company in Las Vegas they also sent out the injector pump to be rebuilt. So far once I got the vehicle back to me I found many loose nuts and bolts, loose wires and now this.  It looks like I should be able to pull the flex coupler and access that Nut. Thank you

[Charles 230SL]

You'll need a "grooved" socket to tighten that flange nut (example photo attached). I had mine loosen a few years ago - the first indication I had was an erratic speedometer.

[landsea]

Any idea if that special socket has a part number for a size so I can get one ordered? I’ve looked through about any shaft and transmission blowup diagram that I could find. strange that I never see this nut on the diagram. I’m sure somehow I overlooked it but this is pretty much the situation and I have been expecting.  Thx

[Charles 230SL]

Any idea if that special socket has a part number for a size so I can get one ordered? I’ve looked through about any shaft and transmission blowup diagram that I could find. strange that I never see this nut on the diagram. I’m sure somehow I overlooked it but this is pretty much the situation and I have been expecting.  Thx

Seems there is an MB part number, I've searched through the forum a number of times but can't find it. The tool is crazy expensive and several guys in this group have made their own out of a regular 1 1/8 socket: https://www.sl113.org/forums/index.php?topic=7828.msg61029#msg61029.

[Charles 230SL]

Here's one at Authentic Classics - looks like MB part number 186 589 11 07 00.

https://www.authenticclassics.com/Socket-Slotted-Mercedes-K4A025-Transmission-Flange-p/auth-009757.htm

[landsea]

Thanks all, going on lift Friday morning.