ben23
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With refined research about Sub Symetric, the bottom line is NVG viscous coupling up to 2008 before switch to NVG progressive coupling (gerotor pump design). Basically, up to 2008, the top of the line Subaru transfer unit is a light version of the nv249 used in 1993 to 1998 Jeep Quadratrac. In 1999, jeep quadratrac II using gerotor discs becomes the top tc available for the brand. Only 9 years later, subaru will adopt this design (after patent release). Take note: Don't worry as a first owner. It will last. Second owner should required complete history, check tire brand and condition. Even an underinflated tire should bring suspiscion. Rust is a issue not only because of climate but also and mainly because of structural weakness. Design speaking, german base flat H engine are agricultural and rough. You can feel the lower center of gravity and the benefits on road. But in the rough it's an open tool box.
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I road test four so far. Common issues: Frame less side windows shake badly at speed. Shock absorbers seems ok on all four cars but potholes are a nightmare and the body rattles badly. A mechanic told me that the transfer case use a viscous coupling system and a lack of maintenance as simple as an under inflated tire can ruined it. Above all servicing it involve transmission removal. I have also learn that it is costly compared to most manufacturers that use identical t-case built by New Venture (US MFG). He also told me to buy a 2007 and up model because they use Jeep gerotor type t-case, no longer protected by patents.