Some of the posts I read where the bushings lasted less than a week were from several years ago. Figured they'd figure out there's a problem by now. Kind of weird how mine were set up. Front shocks had poly bushings top and bottom, but the rear shocks only had poly on the bottom. Top were a very soft rubber with the bar pins already secured.
That's another thing. The bar pins were just rolled sheet metal. I thought that was stupid too, but it seems that's how almost all of them are made.
I paid around 310 for my Bilsteins and they have been great so far.
On the softest settings, mine feel great on washboard. I can hit speeds over 40 MPH with relative comfort. Softest setting on uneven trail sometimes feels like it'll flip. On road, I haven't been able to find a good balance yet. 1 is way too soft with excessive body roll. 9 feels like my axle might be welded to the frame. Sometimes, 3 feels about right for the road, but speed bumps are jarring.
I should have bought the shocks when Rancho was giving away the remote adjusters.
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Btw, your sustained 40mph driving over washboard roads are more than likely the cause of your premature shock failure. They are probably overheating and failing; if you were to get some decent remote reservoir shocks you most likely would not have the issue. I am sure Khris (our local shock expert) would be able to provide some additional insight to this