I had 45,000 miles on them, however I noticed something thousands of miles ago where I was just getting his extra clanking noise up front try to research it and everybody said the crossmember at the calipers check all this as soon as the shocks were replaced no more noise, I believe I had two blown out shocks for about 30,000 miles these Rancho things are garbage. When I was reading my window sticker on my truck they made it sound like the Ranchos were such a wonderful thing that they were doing for us LOL, I am running a 3/4 ton however so I know I'm going to have a much rougher ride but these bilstein's make the ride really really good even for a 3/4 ton truck. So replacing them was probably the best thing I could have done and should have done many thousands of miles ago but I only learned about the shocks on this site