Do you mean "retaining"?
Its where the bottom of the spring is clamped to the lower spring mount and likewise with the top. The shocks are longer than normal and this allows the axle when fully dropped to then stretch the spring rather than the normal practice of having some degree of compression on the spring at all times to keep the spring from falling out. This type of setup can allow more suspension travel. It doesn't affect the ride height and can be done with any coil spring. Not all suspension designs will benefit from this setup either.


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