rear end wiggle?!?

Alright this is real hard to explain but I'm gonna try to do it to see if anyone has any suggestions ..... I have a 93 N/A when I turn left about half way the rear end gets this wierd wiggle almost like the rear tires tired to turn but it just does it once then when I come back out of the turn and straighten up the wheels it wiggles again .... it only does it when I turn left ... I just replaced the rear wheel bearings one was shot and the driver side rear hub but that didn't fix it ... I ordered sway bar bushings bc they look shot and thinking maybe that could have something to do with it they haven't come in yet but does anyone have a guess as to what this could be???

Struts.

Push down on the rear quarter panels of your car in an effort to compress the suspension ... see if one side is noticeably softer than the other.