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A lot of this info (e.g. cracked front housings, loose air compressor brackets, drive shaft vibrations, etc.) is in my troubleshooting doc in my signature. The nut he's referring to is the one on the front of the gear of the air compressor. With the front cover off it is accessible. The...

I also posted this above, as an edit, but wanted to make sure you saw it... "Leaking engine oil, transmission oil (if not converted to ATF), power steering fluid, and diesel all look fairly similar. The original military fluid in the cab lift hydraulic system is red, but I get the impression...

No, there isn't, and even the offline fix is a pain in the rear end (have to take all the stuff off the front of the engine). I wouldn't get too worked up about that being the cause yet, though. While your leak seems (from a couple poor photos) to be in a similar spot as you would get from a...

These trucks have large quantities of fluids in them. You can make quite a mess with a rather small quantity of fluid, so it can be tough to use "which one is low?" as a troubleshooting method. When I cracked a transmission cooler line, there was transmission fluid everywhere on the rear lower...

From the first picture, it looks like it is higher up. There is liquid pooled on that metal line on the air compressor / power steering pump, so it's at least that high or higher. That eliminates transmission. There are a bunch of potential culprits in that air compressor / power steering...