I had 4 (all replaced under warranty by Nissan) and every one of them had 1>2 grind. The first one had such bad internal bearing howl it was unbearable. Find a good low mileage used one instead. If I had it to do all over again,that`s what I`d do.
Here`s a video clip of my 1>2 gear grind. This tranny was grinding like this immediately upon install. Hope I copied the link correctly.