The springs are not actually retained. The shock or other device limits the travel of the axle so that the springs remain seated. If you want your rig to look cool when going over rocks or ruts, go for the cones. However, they have not real positive effect on your ability to get anywhere. They tend to be used by people who have spring lifts using stiff springs and therefore have little spring movement. So the question should be more whether you go for long soft springs that allow the spting to remain in place or whether you go for stiff springs that require cones to get any movement. The weight of the wheel is the only thing providing some traction on a dislocated spring. Therefore the traction is virtually non-existant and not worth the effort.
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