Driveshaft center bearing? May be the tranny mount, I had one that
sounded like something bad in the driveline. The noise changed a
little at varying loads and went completely away on hard
acceleration. Does yours sound like a pinion bearing going South? The
whine should sound noticeably different on accel/decel if it is. You
could do a backlash measurement or compare to another similar vehicle.
I get the impression that the noise originates further back than
the center bearing, or the back of the transmission. But of course
with noises it can be awfully hard to pin down.
It's a 240D automatic. What hard acceleration? :-)
Taking the car to the paintless dent removal place I'm thinking the
differential is quieter than it was. (With 1/2 pt new oil.) Enough
that I think I'll clean it out and put in fresh oil. That sludge in
there can't be right. The cruise control, unfortunately, was the same.
It works at first, then sinks about 5 MPH (to 60).
-- Jim
