No "Engine Shocks".
Two (2) motor mounts (Hydraulic)...Test is: whilst underneath be able to fit a
13mm measuring device [anything 13mm tall will do] between the bottom of the
MM and the Body rail. If you cannot , the mount's collapsed internally.

The single suspended rubber transmission mount does double duty as a rear
engine mount also.

WHOA, see if your white plastic bushings (In your transmission shifter linkage)
are worn or missing , First! (Parts number 17 and 188 in the Cyrillic Pictogram)

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'84 300SD sold
124.128