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There are adjustments on rear windows the window is incorporated within an envelope with two top bolts for lateral adjustments and the bottom has an adjustment for tilting whole window from top to bottom. Of course you have to remove the interior panels to access it then there four bolts that trap it with a cover plate
I should have asked does the rear window align with door window ? You will need to check this as well
If the rear window align with the door window and the doors window align with the top track completely it maybe the the rear windows top track i dont think there is a lot of adjustment on this piece but you can try lifting the top partially maybe straight up and see if this piece is loose or a fastener has come out or broke. Im assuming the other side of car Windows are all in alignment. By reading your post im not aure if you mean the rear window is just shirt of reaching the tops track but aligns with the fronnt window is this is the case then you would want to acces the rear windows mounting fasteners as i mentioned earlier just loosen the top two and bottom center bolt on window frame it is all one piece and slide window up to meet required height. Hope this helps.
