"Is the vibration damper easy to remove? "
"On my W126 1985 300SD, vibration damper front of drive shaft near flex disk blocks access to the trans mount top nut. I want to remove the transmission mount to get to the front flex disk and replace both flex disks. Cannot get wrench on top transmission mount nut. A usual 19mm open end or box wrench does not get a good grip on the nut and just slips. "

Found solution. Support transmission with jack and wood or similar but not on the cross member. Remove rear transmission cross member under the trans mount. 6 bolts. Mine hung down on a wire from the trans. I just let it hang. Unbolt the vibration damper by removing the locknuts and bolts joining the flex disk to the driveshaft flange and vibration damper. The vibration damper will be unsecured and easily slides to the rear. Should be space to reach trans mount top nut. However, not sure if is wise to reuse lock nuts. Maybe reinstall locknuts and use 3 extra nuts on top as jam nuts.
I used new flex disk and hardware as my real goal was replace flex disk.

Pictures: First two not mine. Found on peachparts.com Third my vibration damper and transmission mount.
1st picture Vibration damper. 2nd picture vibration damper 3rd picture trans mount W126

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