Driving with hardtop window open?
 

Is it bad to drive with the rear window of the hardtop open?

Nope. I have a friend who does this frequently with his dog in the back. I don't see it hurting anything.

Not at all you will be fine driving with the rear window open... actually makes for a nice breeze running through the Jeep.

I recall the owners manual saying not to do that because of fumes coming in when driving at certain speeds. I think it said to have other windows open if the back is open.

I do it for my dog sometimes but I go real slow. I tried doing it on the highway once when transporting a sup board and a couple times I hit the brakes I could hear the window jerking but everything was fine

When I do it, I notice the struts get tight and makes the window harder to close. Not sure if there's any negative long term effects on them.

I remember someone posting that their rear window shattered while open.

I suppose it depends on road conditions, driving speed, the wind, etc.

You're adding unusual torque and vibration to the glass at the hinges.

used to do it ,the struts went bad in 3 months ,
and $35 each, ouch

X2, did it in my grand Cherokee a lot, replaced struts twice. Also be mindful when u back up.

That's weird? There's a tailgate vent in the rear that allows for pressure changes and air flow.