Burch

This is weird. I was driving on the freeway at around 75mph, when I felt a sudden but slight sensation that the car started to drift. It was on a straight stretch of road so I assumed that a mechanical component had broken. Afterwards, the car drives okay and doesn't pull or anything. But I could tell that something wasn't quite right. I went over a few "speed humps" and instead of the susspension bouncing the car up and down, the car rocks diagonally on the suspension. Driver rear and passenger front.
Did I blow out a shock? Ball joint?

justnspace

iTrader: (1)

^its kinda hard to tell without looking at the components.
especially just by written word.

If I were you, I'd do an initial quick check of the bottom of the car.
to see if anything were broken or snapped.
you will notice quickly if something were broken.

if not, head to a trusted mechanic to get it on a lift to check.
How are your tires?
whens the last time you had an alignment?

Fulani has a TL

iTrader: (1)

Rear sway bar? or end links? Could even be the RSB mount has cracked the subframe too.

So many variables, I would recommend getting the car onto a lift and then you will be able to see better all the components.

callahan

I would guess sway bar, also have you look at your tires lately? A flat tire in the rear can give a similar sensation.