Originally Posted by E34Play

Stumbled upon this thread while researching an issue I'm having...

I have BC's installed on my 4.6 and at speed (If I recall correctly above 50mph) it acts as if I am towing a VERY imbalanced trailer, it will violently sway side to side if I'm not careful.

I left the rear bags in place but I disconnected and emptied them... any ideas what the cause could be? I never had these symptoms before, except once or twice when the rear bags had drained and failed to air back up, it would sway when the rear was squatting... at normal ride height it drove great.

I know rear control arms can cause this, but it feels much more violent than when my other cars have had bad RCAB's. I thought it was related to the fact I drained the bags completely, but it seems the rest of you have done the same or removed them entirely. Thoughts?

Edit: After more thinking, I haven't yet got an alignment, perhaps there's a relation between the lowered ride height and unstable handling. Think the toe could have changed enough in the rear as a result of the drop?