Rotational Rumbling / Bouncing at all speeds

Another fun one for y'all, this time more mechanical.

There's a distinct rumble & associated bounce with every rotation of my wheels. I can be going fast, slow, doesn't matter. Also doesn't matter if the ICE is on or off. Sometimes, when I'm going like 2 mph, the rumble sounds more like a grind than anything else, and it vibrates the car a little.

What I've done:

• Checked all four wheels for lateral and vertical play, (I had assumed bad wheel bearings or ball joints). No play present whatsoever.
  
• Checked brakes for warped rotors/bad calipers. Replaced both front rotors & pads, calipers were fine. Rear drums fine.
• Had tires checked. All four fine, not structurally compromised.

Yet the rumble and bounce remains. Sometimes it's worse, sometimes it's not so bad. Not sure what triggers that. Turning doesn't seem to have any impact on the severity of the rumble.

Ideas?

 

Oop, sorry, should have mentioned. I did that. Also had two replaced. The other two have minimal wear.

One rim was bent (it was like that when I bought the car a few months ago) and I replaced that, too.

 

Hmmm, will do. Not sure if that would cause the vibration and rotational bouncing, though.

 

I should also say that when you spin the wheels off the ground, there’s no grinding, no wobble, no nothing. Everything stable and quiet

 

Just checked—Yes, it is the OEM axle!

 

158k 2004, not sure about the service history on the suspension, though. I’ll check that out tomorrow.