So I was able to pull the slider out today. Found most of the drains were clogged as well as the frame drains were clogged too.
Ended up using window cleaner on the gasket, then cleaning out the channels with a rag and screwdriver.
Cleaned out the frame channel as well. You can see the run off channel on the bottom that goes to the drains.
Cleaned all the drain holes and the channel and ended up with this crud... there is still a lot on the rag too.
Next was the slider frame and cleaning out its drains...
popped out the seal for the slider when its closed...
Cleaned out all the crud on both sides.. and reinstalled...
Pulled the pin for the window stopper in the center and cleaned the felt off...
Reinstall the gasket...
Just make sure you install the gasket the correct way. I ended up putting the inside facing out... and sadly didn't notice until I had it completely installed. Pulled it back out and reinstall the gasket the correct way and back in the truck.
Before installing the window I check the body for any corrosion which there wasn't any. Cleaned the matting surface then installed the window.
I did run some silicon on the seams at the top corners of the cab, then ran silicon on any seams that had gaps...
While the best way to reinstall the slider is with 1/8"-3/16" cord, I could not find mine. So I had to pull the gasket back in with screwdriver. Not the ideal way but it can be done. You just need to be careful not the tear or puncture the gasket. You see here how the latch is on the outside. Oops!
And proof that I did catch it and fix it. LOL
I did a water test. Good news - slider and seal not leaking any more. Bad news - found a new drip. Same area but coming from between the 2 panels below the rear window. Its not the window or seal, its not the cargo light. So tomorrow I start using tape to find it. You can see the drip on the rib next the carpet edge. Its just enough to call it a day and attack it tomorrow.