I am getting a bad vibration from the front end around 60mph. I work for a tire company and I don't believe that they are the problem since it doesn't do it every time at the same speed just most of the time. My girlfriend was driving behind me on the freeway and she said my left c.v. axle was bouncing up and down but the hubs aren't locked in? I checked the front end and there is some minor play in the pitman arm and the tie rod ends, and the steering dampener is original. I checked to see if the c.v. axle would move up and down but it seems fine if you grap it and try and shake it. I also checked my drive lines and the u-joints seem fine. The truck has a four inch lift and it was done before I bought it.

Thanks,
Brian