Copied from GoRancho.com
Tenneco Inc warrants qualifying Rancho products against defects and wear-outs when used on private passenger cars and light trucks under normal operating conditions for as long as such purchaser owns the vehicle on which they were originally installed and Tenneco continues to make the warranted product(s)
I dont know when they were replaced with the current model, I was just looking up warranty details when I found the 9000's are no longer on the website.