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Rust and bushing wear are problems with the rear suspension components in these vehicles. You did not mention the year, but you probably have leaf springs back there. You need to check the shackle bolts and the leaf retaining rivets for loose or missing parts. If you have coil springs, check the lower spring bumpers - one or both my be badly worn or gone. And yes, any bushings may need replacing.
As far as the brakes are concerned, that is probably the noise you hear. You need to have the shoes replaced right away, and since they are that badly worn, the drums will need to be turned or probably replaced.
Could be a tire hitting the inner fender skirting. Check both front tires to see if they are clean/scraped right at the tread and side. This is a good indication that the tire is rubbing something. Also, since your turning right, you put more weight of the vehicle on the left side. You might want to check the front and rear wheel bearings on the left. I've heard them click before, but only under pressure.
Look under your car for a sway bar. The ends of this bar are held by 1 bolt on each side along with plastic bushings. The swaybar should be visible hanging straight across the rear differential cover. They are subject to rust and breakage, and aftermarket parts are available. They may be also called "Swaybar links".
Check for noise from your rear seatbelts. Sometimes the ends get pushed under the seat and they rattle when the car shakes. Also check the spare tire. The jack on your spare tire can be touching the rim and will rattle. Sometimes the jacks on Crown Vics and its sister, the Grand Marquis are mounted separately behind the carpet on the passengers' quarterpanel. They are held by a twist screw and it can back off over time.
I hope my solutions help you find your problem. Thanks for using Fixya.
It's probably the rear sway bar links. If you can jack your car up and check right behind both rear wheels you will be abale to see the sway bar which is connected to short links about 5in long with ball joints.
If either of them are broken or not connected anymore it can cause some pretty loud noises when you ride on rough roads or hit bumps. They run about $35 per link so it's not a very expensive repair.