One reason we wanted Certified used is so we can get an extended factory warranty, we have a 8yr - 80K. Now that I'm looking to put a lift on it I called around to all the local dealerships asking if a 2" lift would effect my warranty. The two closest said they would deny service on a power window if a lift is installed, per Chryslers policies. That is just rediculous and made me not interested in dealing with either. I did find one that seems to be willing to work with me. They said that if the parts are directly related such as suspension or CV joints they may not, but electronics, motor, transmission all would be fine. Unfortunately, they are in the wrong direction for you.