[MW]

Car vibrated violently under power at 35mph. Recon was done on driveshaft which solved the issue. I however now have a different vibration between 20 and 25mph which repeats at about 40 to 50mph - only on acceleration.

I balanced the tires with no improvement. The rear tires were 0.5 bar harder than the fronts after some towing, when I did a tire rotation. So I ended up with the front tires at 2.7 bar and the rears at 2.2 bar. The vibration was gone. As soon as I deflate the front tires back to 2.2 bar, so I have the same pressure on all 4 corners, the vibration comes back.

Anyone with suggestions on what can be causing this? All 4 tires are regularly rotated and I fitted them about 15,000 miles ago.

[MADBMWX5MC]

That's an odd behaviour. What did you end up doing?