I have a 71, 240z, with an early 5 speed transmission that was rebuilt some years ago, maybe 10 or so. The shifter rattle is louder and more noticeable in 1st, 3rd, and 5th, but is happening in all gears. It feels and sounds like bad shifter bushings, so I pulled the shifter and all the bushings are in great shape. If I hold the shifter, it gets quiet and feels pretty smooth, just a little sloppy. The motor feels smooth and I'm not hearing any odd noises. I'm just looking for some insight before I start tearing my car apart, and hoping for an easy fix too...lol