2006 tailgate window rumble at speed

[Bill58798]

Hopefully someone has heard of this issue and may be able to offer some help...
(I've used this forum from a Cherokee standpoint for many years, now it's time for my Liberty!)

My 2006 has an issue with the tailgate window. At speeds below 70, I have no problems whatsoever, but at 75-80 I start to get a rumble from that window. Funny thing is that it's not an all the time rumble. It has a frequency to it, where it will get louder, then softer as I drive (even though I maintain the same speed).

Suggestions? Thanks in advance!

 

[ltd02]

How are the lift supports and the weatherstripping? I had a rattle when my lifts were going. Replaced both and no more rattle. Of course the thing almost takes your head off now if you aren't paying attention.