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this is likely a NP203 specific problem because the linkage is very cumbersome. If you have ever seen it, its a mess of bars and pivot points, etc...
its also not very easy to get at but I do have the adjustment manual SOMEWHERE so let me know if you need it. My np203 in my 77 K10 was the same way, it was very hard to get into 4 lo-loc.. you had to put all your weight into it..
the first thing I would do if I were you is WD-40 the HELL out of the linkage.. then work it for a while.. this wont be a permanent fix or lubricant but it will help unmask the problem..
of course there is the possibility of it being something internal but I bet not
mike
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