I have a 2005 Chevy 2500hd 4x4 with 131,000 miles on factory shocks. I only recently bought it and coped terribly with any kind of bump in the road, the whole cabin jerking wherever I went. When it comes to bumps, these Monroe Gas Magnum shocks take care of everything! Drives like new! I think the biggest problem that caused the cockpit to close was that all the bushings were fried in the old bushings! I would recommend them to everyone!