I’m hear a sound from the rear at 50+ mph, esp on flat but not newly asphalted roads.
I’m trying to decide whether it’s the rear wheel bearing or the CV
Any tips on how to pinpoint the problem ?
Can the source be I pointed by running the car on a lift ?

Find a parking lot where you can do slow doughnuts in both directions. If it's a CV you will typically hear and feel a clunk as it binds.
A bearing typically just squeals.

Jack the rear end up and support it. See if anything makes noise by just turning the wheels. Go from there.

Jim my car is sitting under Matt's on the lift waiting for a new right wheel bearing.

CV's go clunk. Wheel bearings are more of a drown noise.
Because of the size/width of the rear bearings they really don't change sounds when you turn. When I lifted the car and turned the wheel it just felt kind of rough.

Thanks, drone noise is closer to the sound I hear. Ca that Bearing be replaced without pulling the trailing arm?

Jim,

Not easily.

Mine was groaning for quite a while before I replaced it.

You should be able to get it up to about 50 and take it out of gear and listen with the windows rolled down to isolate it.

We're going to give it a shot. I have the late model 911 tool.
Click to view attachment

We'll if I can use some of my other bearing tools to create the pull and push I need.
I too don't want to pull my trailing arms.

I.d drop the arm Cary....

But I don.t have Superinlaw or the toys you have.

Let us know how that works out.

I've never heard wheel bearings squeal. They make a lower droning/growling sound. A parking lot may not be fast enough to detect. On the highway at 30+ mph gently use the steering wheel to rock the car left and right to load each side of the car. If it growls when you steer left its the right side and vice versa. Could also be your gearbox.

Shift into neutral when you hear the noise. If it disappears it's your transmission. I bet it's the wheel bearing though. If it disappears when you turn one way or another, then it's very likely the bearing. And yes, you can change them without removing the trailing arm. I made a tool using an allthreaded rod and a bunch of big washers/bolts to press out the bearing. I replaced both bearings for continuity sake. Removing the first one was a huge PITA, but after figuring it out, the second one was easy.

My RH side on is ,the sound you get isn't anything like a CV,its a speed related rumble...fairly loud too .

Yes. Just did two two them. Biggest problem is getting the axle out. Not enough room. Pulled the hub them the bearing with a slide hammer, pulled the new bearing and the hub back in one at a time with a big threaded rod and washers we made the right size.

You probably don't remember selling me that tool that removes the bearing. Just a piece of all thread rod with some nuts and a plate, IIRC. I think I sold it at an old G&R after I purchased a press.

Yup; when I installed new trailing arms the bearings were replace, probably 10+ years ago.