Well, I think I may found the squeak. I first checked superlift's website to see if there are any Q&A, but got no help. After several days of embarasement driving around town with the constant squeak, I finally called the installer to see if he has any idea. He suggested that I look at the corner of where the front anti-roll bar bends, and the rear set of bump stop meet. Given the liftkit, it comes with the bump stop extender, and if the anti-roll bar is not centered correctly, it can easily scrape against the bump stop.

As it's been raining here in Dallas for the past 2 days, I have not had a chance to get a wrench to adjust the anti-roll bar. From peeking underneath, it does seemed to be the case as they are very close to one another.

Hopefully, that'll be the solution. I'll get under my truck and tighten all other nuts and bolts when it stop raining here...perhaps on Sunday.