Your front t-case seal is bad for sure. Why don't you disconnect the front ds and/or the rear to determine whether the issue is with one of the ds's or the t-case. To me it sounds like a t-case issue because of the proximity of the sound relative to the GoPro camera.
Funny, I just had the transmission replaced at the local transmission shop and they said the transfer case checked out. :naw: This was after my son went in the lake. How hard is it to replace that seal?
I removed the front driveshaft and drove to the local AutoZone to see if they could help me identify the u joints. No noise on the way there, but they couldn't help me much. I've not been able to remove the u joints from the driveshaft yet; will rent a u joint press tomorrow (should have picked one up but thought I could use the socket trick).
I found some identifying marks on the driveshaft ends and the u joints themselves. One u-joint has 4 external clips and is marked 151 on one side; I cannot read the markings on the other side. The other u joint has 2 external clips and two other caps that came off as soon as I removed the driveshaft. It's also marked 151.
One end of the driveshaft says Napco and it appears a PN 22C357 A0. The other end has DCX8 and ?35821. Here are more pics. I'd appreciate knowing if these are standard 1310 u joints I can replace with Spicer solid ones and if so, exactly which part numbers might I need? The pic of the u joint without a cap has no clips I can see internal or external. Also, I've added some pics of the transfer case yoke and D30. Any tips on things that look wrong would be appreciated. Thanks!