Ah. I've been out of the loop for a while.
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The flex of the rear axle is a design target in order to "soften" the ride... :D
I had to go pickup my mudda-in-law a couple months back. About a 420 mile round trip. I did it in the mighty Blueberry. I saved MEEEEELLIONS in fuel expense.
On the way back, there's a railroad track that seemed to bottom out the rear suspension. It felt like the rear tires hopped off the ground after bottoming out. It was rough ... and the mother-in-law had just had shoulder surgery so she didn't like that. But aside from that 1 event in roughly 16k miles, I prefer the softer suspension. When I decide to race the Blueberry in IMSA at Road Atlanta against the experimentals (or whatever they're called), I'll consider a sway bar.
Im not sure what you mean by amortization.
I was wondering instead of having a weld that attaches to a plate beneath the springs, maybe it would be possible to have the ends of the bar bent into a square end and placed where the bottom of the shock usually goes. with the one bolt to hold it. Although i havent given this idea much thought.
3 years ago I suggested using a bar that's actually designed to twist. Why not just buy a sway bar. The hardest part would be figuring out what bar will fit. The easier part would be fabbing up mounts. I still plan to check out the sway bar rack(pile) at my old work and hopefully find something that'll work on these turds. Planning is hard though.
Google cavalier or cobalt rear sway bar. It's a thing.
I suspect the design of the UR sway bar would help it survive better. It's more of a bent solid bar. Someone stated it comes with a free replacement warranty, but I haven't seen that myself. I see a 1-year manufacturer warranty listed.
The part # is UR-AR19-422, & it's made in Malaysia.
Even though I remember seeing a pic of a broken UR rear sway bar, it looked like it could have been welded back together & put back on the car. The attachment plate just pulled off the bar & needed to be welded back on.