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Yes, you are correct, it does have cooling, the two cooler green tubes in the thermal image (running at about 65C/ 150F): I will take another shot next time, right when exiting the freeway after driving 70-80mph or maybe even while driving it, will try to make some adapter to install the...

I still have to change the front hubs oil, which should be done in the next few days and the only two fluids that I didn't replace are the steering and brake. Both have the right levels, didn't even have to top it off and they look good. I will eventually get to it, but it didn't seem a...

I will check the rear differential level, was planning to change the GO to synthetic. If indeed there is glycol leaking into other components, then the coolant level should be dropping, correct? Or if I run the engine (not the truck) with the rear differential drain plug open, there should be...

Not sure if I have what's called the remote reservoir pump, but it looks like this, with the vent line connected at that brass piece:

Agree, I am checking everything and I also get many good ideas about what to look for from you guys.

I will check the rear differential if it’s overfilled. It sounds like my truck should have glycol (SN over 300,000) but the only coolant I did put in is the green I drove it about 12miles when I took that infrared shot, not sure if that was far enough? From what I read, the helical gears...

Agree, that's why I asked about the bolt above the spindle, which also looks like it could be a fill port. Another telling thing towards the overfilling theory is that both hubs seemed to have about the same amount of oil, which would be less likely to be equally distributed if it came down the...

Ok, I think I understand. From what I read, it sounds like the ECVs were the first level of recent upgrades part of the MECV program (perhaps that's what others call REV A) and then later on serial numbers above 300,000 it was the Reliability Enhanced Vehicle (like mine) which it sounds like it...

I should have mentioned that it was the two rear hubs, so your theory could be correct, The oil smells like gear oil, it's easy to tell, but also I am not sure how the steering oil smells like, as I haven't replaced it yet, it looks clear and has the right level (but I think you are saying that...

I didn't check the transfer case level yet and will do. The transmission oil level looks good, It hasn't changed since I replaced it and the original oil was very clear.

I understand and appreciate your feedback, I don't have much experience myself. On my truck the power steering line is not connected to the rest of the vent system and it is routed by itself to the top of the air intake stack, it was built like that from the factory, maybe to solve exactly what...

I thought the oil is dark because it was very old, maybe from 2012, or maybe even factory fill from 2009 as the truck had only 7k miles and maybe they didn't change it. Yes, I do thermal testing using an infrared camera and the hubs look OK, one thing that seems to run hotter is the rear...

Yes, I did remove the fill plug first and that's when the oil started to pour out, from the fill plug,, that's why there is so much oil under the opening. The truck did have deep water fording originally, but it was removed by GP, I did buy all the deep water fording parts, but didn't install...

As I pulled the tires to rebuild them due to a vibration around 70mph, I decided to also change the geared hub oil. When I opened the 1” fill plug, a lot of oil started to pour out and ended up being about 30-40% more than the specified 1/2 quart. In the picture the cups are 528ml (0.55 quart)...