Boy, this thread got twisted around!
When I first got my Nismo. It would slide into first from second with no problems AT any speed, and no matter how fast I down shifted. Now it's having a harder time doing it. If I take my time, it will go into first at any speed. If I try a quick down shift, it hangs up some. I have to muscle it. Change fluid from stock to Mobil1. Still does it.