Broken sway bar or sway bar links.
I think your rear shock absorbers are Kaput. You may also have a broken sway bar.
i"m not sure if a Lincoln navigator would have a sway bar, But my sway bar broke in my Chevy celebrity once and the whole car would rock side to side after turns and such. it's a bar by the rear axle and mine literally broke in two.
When the rear wheels of a rear wheel drive car break traction the rear of the car swings back and forth in a manner reminiscent of the side to side motion of a fish's tail.
Sounds like wheel bearings.
I am guessing the rear anti-sway bar? Spoiler
Could possibly be your drum or caliper seized. In any case try rocking your car back and forth. Shift in drive and reverse to rock the car
Just had that problem on the rear of a Lexus ES300 and it turned out that both rear sway bar frame bushings were worn out. After replacement the car sounds quiet.
My car does because the sway bar is lose. I just dont have the money to fix. Get underneth and shake the swap bar and se if it moves.
It can be very dangerous especially at high speeds in a curve. It causes the rear of the car to become very unstable.
Yes it can.
A rear seat in a VW car that is stuck up can often be fixed by moving the release while gently rocking the seat back and forth. This will allow the release to disengage and move the seat.