I had the Bilstiens on my last Dually and loved them. No complaints.
On my new one I put the Rancho 9000 to have the adjustability of the diffrent settings on the shock and they work good too. No complaints. Plus I found a buy 3 get 1 free deal that was too good to pass up.
Either 1 is a good shock so see where you get the best deal and "just do it"
A few that have cranked up their torsion bars to lift the front of the truck complained about the resulting 'pogo-stick' ride. That happens when the A-arms no longer rest on the yellow travel stops/bumpers and the suspension can move more freely. When that happened to me, I just reached under the truck and cranked the red knob on the Rancho shocks a couple clicks stiffer. Problem solved.
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