These have about 2500 miles on them. I traded in my Z71 for an 07 2500HD and took them off when I traded it in. The ride quality was outstanding. I just put Bilsteins on my new truck and wish I had gotten the Ranchos. The ride quality on them just isn't the same. I have the fronts and rears. I put a 2" block in the rear so the rear will work for that. $150 for fronts and rears.