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#1
11-17-2009, 07:44 PM
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Rear End Roar
I have used this thread for invaluable information, but am unable to find a thread that addresses the roar that I experience under load/pressing the pedal. I have replaced the driveline boot and bearing. That got rid of the grinding sound. The flex coupler looked to be in good condition, so it was not replaced. Any ideas on what would cause the recognizable roar from the rear end? It becomes high pitched at high speed and almost disappears. 20-40 mph almost drowns out the radio. Thanks...
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#2
11-17-2009, 07:56 PM
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Sorry...'83 300SD
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#3
11-17-2009, 07:56 PM
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Are you able to isolate the source at all, even a bit? Could be anything from the Diff to wheel bearings to the CV axles. Try to see if it is in the center of the car or if it is by the wheels.
__________________
TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth
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#4
11-17-2009, 08:11 PM
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I assume wheel bearings would be constant, not just under load. It is hard to isolate, but definitely coming from the rear end. Last time I heard a similar noise was on a Ford Explorer with a differential problem. It is not constant and occurs only when pedal is pressed. Thanks...
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#5
11-17-2009, 08:29 PM
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could be differential. get the fluid replaced and look inside.
use heavier fluid, see if that helps. ????? 
__________________
1979 300D 220 K miles 1995 C280 109 K miles 1992 Cadillac Eldorado Touring Coupe 57K miles SOLD ******************** 1979 240D 140Kmiles (bought for parents) *SOLD.SAN FRANCISCO/(*San Diego) 1989 300SE 148 K miles *SOLD
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#6
11-17-2009, 09:05 PM
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If the sound peaks at certain speeds and if the thing "howls". Your rear end is shot. I'm going through the same thing. I just got a line on a replacement. If it does not clunk too bad check the simpler things first.
The noise is a result of the gears not meshing properly. The clunk can be other more serious things as is the case with mine. Here are some pics of how bad it can get: Excessive W123 Differential Wear - Pictures
__________________
AJ 1985 300D (SOLD) 
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#7
11-17-2009, 10:52 PM
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-have no "clunks"...just the roar/whine...knowing the recent owner as I do, I'm sure it never crossed his mind to check the rear end for anything...I will have a good mechanic drive and diagnose...thanks...my fears are being confirmed...
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