Bad ball joints squeal as well -- check for looseness. Bad struck mounts are obvious -- check for evidence of contact between the retainer bar on top and the shell of the mount. If there are cracks in the rubber, they are shot, replace them.

Ball joint can be done with the spring in place if you put a jack stand under the control arm and sit the car down on it. Press in and out with a standard cheap tool from Harbor freight, although you will need something to push on the ball joint with going out. They are directional, make sure the notch points toward the center of the car.

You may also have bad lower control arm bushings -- replace the control arm, it's cheaper and easier that swaging the bushings in. Requires a spring compressor.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!