'06 LR3 rumbly ride. Smooth acceleration and shifting until 30mph. Then it's like driving over cobblestones. Highway speeds back to zero mph same whether in drive or neutral at every speed. Vibration very different from wheel balance or alignment problem. Tire pressures fine. History of air suspension faults, but not currently.

Really stumped by this. Thoughts?!?

 

 

I thought maybe wheel bearings. Doesn't explain why it waits until 30mph to kick in though? Or does it? 🤔