How can you flex like that without popping springs out? I only have a 3" and pop out my springs. Sucks... One of the things I hate about my WJ...
I actually have the uppers installed in my Jeep. I just have a 3" OME with Bilstein shocks bought through Kolak. The IRO Retainers keep the springs from popping all the way out but the other problem is when you flex that much the springs come out of the rubber Spring Isolators and of course just smash them instead of going back in them correctly because when your twisted your not at the correct angle. It's pretty frustrating.
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That's what the lowers are for (second picture and link), keeping the springs from pulling up the rubber isolator.