Right - and I bet the window rattle was there before the kit..................

 

I understand why the steering problem isn't covered due to level kit. Was the battery disconnected during install? Some mechanics aren't aware by Ford changing to electronic steering.
Yes I'm sure the rattle was there before the lift. No correlation between the two. Rear window rattles like an SOB for some...period...it's anoying. Real bad on country roads. If you are a freeway jockey you won't hear it

 

It is not actually rear sliding window. I just took mine to Long Lewis Hoover, Alabama. They found it and fixed it. It really doesn't rattle anymore. According to my dealership, it was rattle in headliner. both rear pushpins were loose.