Thanks. Receiver Drier it is. Whatever it was, it's in the trash now.
All done. Everything is gone. It was a total PITA. I should have just drained the radiator and pulled it, but I thought it would be quicker not too. Uggh. I had to use a breaker bar on some of those bolts. All clean and spiffy now. Soaking everything in rust remover. A battery had obviously leaked and corroded that whole side. The tray was gone. I've got all new stuff from LMC that I'll put on this week.
A lot of what I've been doing since I got this truck is yanking out all the crap that one of the POs did. Speaking of differentials, this thing has a 1970 3:73 rear diff that says "PO" on it. Anyone know what "PO" might mean? Is it positraction maybe?
Thanks for the help.