So heres an update for me. I havent reached out to ramcares or a dealer yet. Basically because my truck is used and out of warranty. I also dont want to wait forever (which is the typical wait time at my local dealers). And, I am going to go ahead and guess that the cracks are going to come back. But I havev googled the new PN you guys are posting and its only like $600, so I guess thats not that bad. However, I have some new info after further investigation into my leaks. I noticed the fresh air vents leaking, and the next couple paragraphs maybe boring, so you can skip to the fresh air vents section. LOL
After my initial post on here about this (which was just asking about putting silicone on it myself) I bought, as recommended, the Permatex flowable silicone. 4 tubes. I cleaned and let dry around the top of the rear glass and third brake light. I then used two tubes of the Permatex flowable silicone along the top of the rear window. I went all the way across the top except stopped about 4-6 inches from each side because I thought it was just above the cracks and sliding window that was the issue. For the third brake light, I removed it, cleaned the gasket and metal really good, then used some other clear silicone (not the flowable stuff) around the gasket and screwed it in. I put a bunch on, so it mushed out a little. Anyways you couldnt tell I did anything unless you got up really close and stood in the bed of the truck, and starred into the channels around the light and window, even then, you could barely tell.
With that said and done. I went a week or so with no rain. Then it came a flood. I went to check my truck to see how it held up. I have an amp and dual 12" subs under the rear seat. The amp was covered in a ton of condensation, and the carpet was wet. So I decided to tear out the back seats all the rear panels, and pulled the carpet back. I gutted the rear completely. Now I could see everything. I got someone to run a water hose (without a sprayer) along the third brake light and rear window. The cracks on both sides of the sliding rear window now DO NO LEAK like they did before. Which was a constant drip, not a stream. However, the water was pouring (a large stream) in down the interior sides of the rear window in the cab. So basically the water came in from the bottom edges near the doors of the rear window. A LOT. I say it came from bottom, but I really cant tell if it is coming from the bottom or the top, I assumed the top, and then down the sides. Mostly on one side (driver's side). The headliner seemed to remain dry. Anyways. I dried everything up inside and outside. Then I applied 2 more tubes of Permatex flowable silicone, one tube per side of rear window. I started about half way to the sliding glass (about where I stopped before in my first attempt), then applied it all the way to the edge on both sides of the glass. I then pumped a ton of the silicone into the top outer corners of the rear window. The silicone ran down the small side channels of the rear window. About 2 inches dried coming out the bottom of the rear glass. So it looks like it might have sealed all the way down the sides. I will peel that exposed glob off later. I then had a little flowable silicone left over and pumped some along the top of the third brake light just to be sure.
Now, the silicone is probably dry, but my interior is still damp. I have a fan and dehumidifier blowing on the carpet as it is peeled/rolled back. I will put the water hose on it tomorrow to test.
FRESH AIR VENTS - NOW on to something I noticed with the entire rear of the truck gutted. There are 2 black fresh air vents on the back of the cab facing the bed of the truck. Typical. They are like 6"x6", and have these very flimsy/delicate flaps. While I had the person hold the water hose on the top rear edge of the cab and top of the rear glass, I watched the vents fill up with water to the point of them about to start dripping into the cab. With the extent of the rain down pour we had recently, I believe these vents (which are located in the center of the cab and right above where my amp is) are actually what caused the carpet to get damp in the center below my amp, and caused the massive amounts of what looked like condensation all over my amp. I dont think it poured ontop of the amp because that doesnt seem logical.
I can guarantee you if you park level or front of truck down hill, these vents will leak into the cab in a major rain event even though the flaps are closed in those positions. If you park front of truck up hill, then the flaps are probably open, but probably wont leak into cab.
When I do my next water hose test, I will get pictures of the vents filling with water, and post them. Oh and my water hose test was on level ground. I dont think it should be acceptable for water to even get inside of these vents at all, there should be some kind of diverter along the top on the outside. Seems absurd.