I can get the last ounce of life out of any part on my vehicles, but I'm not a fan of used struts. New ones are so inexpensive that it doesn't pay to go through twice as much work by taking one apart. In this case, you have to raise the protective cover, then look on the top of the strut body where the shaft comes out and see if there's any oil there. If there is, the strut won't dampen the normal bouncing motions. Even if the top is dry, a strut can lose its ability to dampen bouncing. This can be aggravated by using a lighter coil spring too. A heavier car will overload a lighter spring and it will fail to support the weight of the car properly. The strut doesn't support any weight at all, but if the spring doesn't do that, the car will bounce more than the strut can control.
I remember the struts are the same part number for both of your cars, but I didn't look up the springs. The problem is all you can go by is part numbers, applications, and options on the car. They don't tell you how much weight the spring is supposed to support.
All of this assumes, on my part, that you transferred the struts with the springs as two complete assemblies. If that's right, you may have the wrong springs, and you still could have worn struts. If you disassembled the struts and kept the original springs with the car, that isn't an issue.
Also remember that changing struts requires the car be aligned. Even if your model doesn't have "camber" adjustments, (Ford is famous for leaving this critical adjustment off their front-wheel-drive cars), changing any suspension parts can change the alignment. Ride height comes into play too, so if the springs are a little weak and the car sits at a different ride height as before, the alignment will be affected. Alignment doesn't affect or cause excessive bouncing, but incorrect "toe" can cause the handling to feel unstable, and when the two front tires are steering in different directions, the car will follow the tire with the most weight on it. Normally that's the right one because roads lean to the right so rain will run off. When the left tire hits a bump, the car will momentarily follow that one. That results in the need to constantly correct the steering. The car can wobble from side to side which can feel like bouncing.
Saturday, August 9th, 2014 AT 10:27 PM