First time RRC owner here. Picked up a pretty nice ride and have been fixing things. It has been sitting the better part of 5 years. I've been reading about the Viscous coupling, I have made several full lock turning circles in both directions and all feels like it should. No binding or noise. I do hear and feel what feels like drive train wind up in reverse but I'm going slow and wheels are straight so I doubt its the VC but not sure. Any thoughts on what it could be? It's enough resistance to slow the car down for a quick second then once the binding releases or the car is overcomes the resistance it feels normal till another few feet and it starts to wind up again. I'm going slow like 3mph.

It has a BW transfer case, ZF auto tranny and 300 TDI.

Thanks pb