They work great on the street. I installed spring sliders on my Duster almost 8 years ago now. Mine aren't at the frame rails though, mine are set up a 1/2" inboard for my DoctorDiff spring offset kit. I just made a bracket so the modification is reversible
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The slider improves the spring reaction, since it doesn't have to work through the resistance of the bushings. They also control the side to side flex of the springs a lot better than the shackle/bushing arrangement, which lets the spring flex around quite a bit, which translates into the axle shifting side to side that amount. They use an aluminum bushing and a bearing roller set up, which does occasionally make some noise when it works (they "click" some). But the noise isn't all that noticeable, I pretty much never hear it over my exhaust or stereo.
@younggun2.0 installed his spring sliders with a 3" relocation kit, he also raised them from the bottom of the frame to lower the car. This is his set up..
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