My springs are actually retained, as are a few of my friend's rigs springs. There is a rectangular section of steel bolted to the spring seat very positively retaing all of my springs. The shocks never max out, as they can be damaged by slamming to maximum to often.
If fact the rear springs are retained with the dislocation cone still in place offering some stability for the steel bar. With the removal of two bolts I could choose to use the cones if the whim struck.
The key to my suspension are the dead coils that stretch, but have no space between when weight is on the wheel.
Retaining is a huge deal, especially if an axle over articulates and unseats the unretained spring. It may not seat again without a cone to guide it back in. The best example I've seen a lot is a D90 down Wipe out hill in Moab. There is a dip at the bottom the front left falls in and the right rear can be in the air by a foot or more. There is always that uneasy sound of the spring catching the lip of the spring seat as the spring has weight applied to it again. They can get stuck in a bad position and it's a lot of work to re-seat them. So in a long travel set up, you have to choose to avoid this situation.
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Todd
Carpe Rangius Roverum
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