Poly and comfort don't usually make good bedfellows but poly density does vary. Volvo's original rubber bushes were OK. NVH wasn't such a big issue as it is today. Modern/current rubber bushes, even from Volvo, don't tend to be as good as they were originally. Bottom line, maybe soft rated poly bushes the best choice except on the body end of the Panhard rod when I'd still pick the original rubber one #87033
As spring is actually a torsion bar so if you shorten it the stiffness increases.
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