Originally Posted by GRIESL

If you are sure that it's the sunroof that's leaking, then you can stop reading this now, but......

I had a massive leak in my 85300d on the passenger side. I thought for sure it was the sunroof or the windshield. But it was the drain hole located under the hood behind the battery. A little rust in there chipped off and clogged the hole that drains the battery pan and out the fender. It had been clogged long enough for rust to eat a little hole in the firewall where most of the water would drain. Good luck.