Also duplicating my post from other site:
My 06 HSE has 90K miles and I feel the same way. I have replaced the sway bar links front and rear, which helped but didn't resolve the issue. If I were to sum it up, I'd say that every road imperfection, bump and swale unsettles the car more than it should, for longer afterwards than it should. Does this sound like your situation?
I think there are two possibilities:
1 as others have said on the post, the Shocks inside the air spring are no longer damping the suspension movements, or
2 The valve blocks have leaks internally, allowing pressurized air to move within the spring system from left to right and front to back - basically crosslinking - reducing spring rate of the spring(s) with highest load. If I imagine driving the truck on-road with the crosslink valves opened, I can see how this fits as a source of issue.
Air spring assemblies are expensive, so I guess the proper strategy is to investigate the valve blocks as issues first, and see what happens there. However, I'm thinking it's probably going to be the spring assemblies...
My 06 HSE has 90K miles and I feel the same way. I have replaced the sway bar links front and rear, which helped but didn't resolve the issue. If I were to sum it up, I'd say that every road imperfection, bump and swale unsettles the car more than it should, for longer afterwards than it should. Does this sound like your situation?
I think there are two possibilities:
1 as others have said on the post, the Shocks inside the air spring are no longer damping the suspension movements, or
2 The valve blocks have leaks internally, allowing pressurized air to move within the spring system from left to right and front to back - basically crosslinking - reducing spring rate of the spring(s) with highest load. If I imagine driving the truck on-road with the crosslink valves opened, I can see how this fits as a source of issue.
Air spring assemblies are expensive, so I guess the proper strategy is to investigate the valve blocks as issues first, and see what happens there. However, I'm thinking it's probably going to be the spring assemblies...