3 questions in 1 - parts ID, etc

[Toonces]

Just got my first truck, a 2006 Silveado 1500 with the 5.3, and I've got all the issues chased down now except for these last few...

The first is a P0455 error code, which is a leak somewhere in the evap system. My gas cap is new and down tight, so the next part I'm trying to look at is my vent valve/solenoid, which should be right next to the charcoal canister and tank. I think I've found it based on location, but what I'm seeing on my truck isn't matching either the videos or the parts I'm finding on rockauto. The only potentially cannister-like or vent-valve-like parts I've found next to the gas tank are what's in my picture here. These are right next to the front side of the tank, and have the same type of hoses running to them like I've seen in the videos, but aren't shaped nearly the same. Is this my canister and vent valve part I'm looking for?...

 

Canister and vent valve?

 

The second issue is the leak I'm seeing coming from my rear differential. It's at the front of the diff where the drive shaft ties in. How hard is it to change this seal? Any general advice here?...

 

Rear diff

 

And last is this rubber hose I found that terminates on top of the crank case. I was able to feel above the transmission and trace it as it runs toward the engine. It has some kind of Y branch in it just on top of the transmission, and continues forward further than I could feel. Just making sure this is some kind of vent hose that I don't need to worry about. The truck had some transmission work done just before I bought it, and I've already found some screw-ups when it was being put back together.

 

Vent hose?

 

I'm all ears.  Thanks

[CamGTP]

Usually the vent valve is on the front of the gas tank or right above it in the front of the tank on most chassis I believe. It's a small round one. Your picture is the whole charcoal canister.

 

Your diff leak is the front pinion seal. Pretty common leak. Remove the driveshaft and there will be a large nut holding the diff yoke on. Probably a 30 something millimeter socket for that. Once the yoke is off you can remove the seal. Watching a youtube video would be helpful. I always mark the nut before removal so it goes back on pretty close to the exact spot to keep everything good. I even count the exposed threads to make sure it's the same. A good impact gun does the job for me. It's not exactly the correct way to do it but nobody does it by the book when just replacing the seal.

 

The hose is the vent line for the transmission and probably the transfer case too.

[davester]

transfer case has a different tube, that goes up to the top of the transmission with a small filter cap (goes to the same bracket that other hose for the trans vent goes to).