this may help vibes a little, but I had the exact part on the back of my jeep t-case/manual and all it was for was to keep the gears from chattering when you shift. it is more of a flywheel than a dampener to keep the gear engaged and doesnt allow the shaft to move with each tooth pass, at least on the jeep. auto jeeps do not have it. when i changed my t-case on the jeep I removed it and I did have a lot more chatter and noise than before between gears. sounds like something MB would do. if it was meant to be a balance damper wouldnt it have a rubber ring in between the outside steel ring to absorb vibes?

edit... i see now maybe the triangular portion is rubber? if so maybe it does both.

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)