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I never seen gear oil in an aluminum transfer case of any make or model. The needle / thrust bearings in the aluminum cases are much different than the big ball bearings for lack of a better name in the old cast iron transfer cases. I don't remember what year the NP208 came standard on GM trucks...

Yes you should have it full enough to touch it with the first digit of the checking finger. Leaking transfer case is common. Replace both seals front and rear and try that. I had barbed wire wrapped in my driveshafts a few times. Last time I smelled the gear oil before I knew I was wrapped up...

I looked at the pictures. I would also pull the transfer case drain plug and check the fluid level. If you have an over fill condition in the transfer case it could be the transmission rear seal leaking the transmission fluid into the transfer case. If you drain the over filled condition and...

I would say definitely a rear driveshaft U Joint. Easy jack the rear axle up and support it. Put the transmission in neutral and check for slop and play. Look closely you should see millings and rust in the U joint area. Take the drive shaft off and check. Easy fix. But fix it before it is the...