2G 2G tcase / viscous coupling issue

[Michael Wucher]

So I went for a test drive for the first time after not driving the car for a month due to a turbo rebuild. The other night I did a 3-4 gear pull and noticed that the rpms shot up as if the clutch was slipping. Fast forward a few days and its getting worse, it feels like slip even under little to no boost just trying to get up to speed. It will slip at random times, and sometimes it wont slip at all. A few days ago, I had changed all of the fluids in my tranny, tcase, and diff. When I pulled the drain plug on tcase, the drain plug had a bunch of shavings on it. I've been trying to do some research and either the tcase is having an issue or the viscous coupler is the problem. Is there any way to differentiate between the two? And how do I check if the viscous coupler is burnt up? trying to figure this out soon so I can get back to driving. TIA