I just bought an 06 mega cab 4X4 with a 4" sup. lift. I was driving it this afternoont and hit some choppy uneven road surfice (40ish mph) and I thought the front end was going to shake apart. It scared the hell out of me. It happened twice and I am not sure what it is. I would appreciate the help. Thanks!!!!

 

Sounds like the "death wobble". there is a long thread a page or 2 back you might want to check out. Do you know what brand of lift is in your truck?

 

It's a skyjacker. I have been reading some of the death wobble threads. Man this sucks. This is my third 2500 4X4 Cummins and this is the first time I've experenced the death wobble.