Have been trying to isolate the source of a whine or howl I get on my '85 300d at slow to moderate speeds. One day it sounds to me like the driveshaft carrier bearing... next the diff... or maybe even something in the transmission.

Speed dependent, rises from as stop then seems to disappear (or just ceases to be audible) once you're over 40 mph.

Car only has 105k miles so I am hoping this is on the simple side. Started suddenly after a severe one-day 20 degree temperature rise-then-drop a few weeks ago.

One clue: it is extremely temperature-dependent. Seems to be gone above 8C (46 F). Much louder at 0 C (32 F) or below.

Trans and diff fluid levels are fine.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22