The rear end of the car seems to float (almost fishtale)on acceleration on 2011 Dodge Charger

high speed, sudden acceleration up to 70 + mph causes a very strange sway (floating feeling) in the rear end. It is more severe with one person in the car.

Asked by for the 2011 Dodge Charger
Check your rear sway bar for anything broken or loose. Make sure all connections are tight to alignment arms as well.