I'm not sure when the R380 came out. All the NAS110s came through with LT-77s, and they were all made in '92, for Model Year '93. Pretty much all of them have had their LT-77 changed out to R380s.
That box is not as robust as the 4 speed in your S2A, but it's about as good as that in a series 3. What really makes them better is changing out the fluid (ATF in an R380)to synthetic, with a quart of Lucas. They shift smooth as silk them. Longevity is strictly related to operator care on the boxes, not age or milage. Same is pretty much true with engines.
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