Well, i had the issue of my rear window leaking when it rained hard. I learned from a local body shop what to do to reseal the rear window and thought I would share. I know that this is how the rear windows on 98 up are but not sure for 93 to 97.
1 roll of rear window seal
10mm wrench or socket
rag and alcohal
First off, I removed the jack cover and popped the retaining plugs from the side panels so I could pull the panels out far enough to get to the 8 bolts (3 along the top, 3 along the bottom and 1 in the center of each end) that hold the rear window in place. You also need to remove the coat hanger (phillips screwdriver) from the rear as well so you can get behind the headliner to get to the top bolts.
The nuts that hold the rear windowin are 10mm.
Once all of the nuts are removed you can just push on the cornersand around the edges to push the rear window out.
The old seal peeled off really easy.
Make sure to clean the seal area on both the window and the truck with alcohal and that you get all of the old seal removed.
Once all of the old seal has been removed and the seal surface has been cleaned, its time to put the new seal on. It comes in a roll like shown and can be purchased from any body shop or glass installer.
To start installing the seal, start in the center of the bottom of the window as shown putting the new seal down where the old was.
Move along the seal surface area making sure to go to the outside of the bolts like shown until you get back to the starting point where you should overlap both ends about an inch or so for sealing them together.
You are now ready to set the window back into place and reassemble. Dont over tighten the nuts. I snugged them all down and then gave them all about 3 more turns each. Then reassemble your interior and your done. Took me about 45 minutes from start to finish.