1979 sc noise from rear

[Couch coach]

took car on 600 mile road trip.first leg no noise. afternoon second day a bearing type roar starts. goes away when car is under power.coasting or just not accelerating it starts.to me it sounds right rear. bought a drive axle, started taking old one out tonight. anybody have similar noise. be glad to search -but does anyone realize what you get when "noise" is searched?information overload! bought car about 2 months ago. has performed flawless until this trip.

[adamsison]

wheel bearings perhaps? mine does the same thing... im getting the rear wheel bearings changed hopefully this weekend. will let you know

[porschetub]

Dry our dying cv joint

[jmohn]

From your description, I would say wheel bearing. Although, I would describe the sound as more of drone or hum; changing in pitch with vehicle speed and, perhaps coming and going if you slightly swerve the vehicle (loading and unloading the bearing(s)). Best to change both.

I would characterize a failing CV as more of a low pitched click, tick or knock sound; changing in frequency with vehicle speed.

Been there and done that with both of these.

Jerry M
'78 SC

[Couch coach]

back and forth(left-right) i did not get the bearing noise change that you would expect.noise was definitely very noticeable right before we came to stop.