It's hard to know without actually hearing it. It could be normal shifting noise or it could be a worn out synchro. I have the 4.0L I6 with the 5 speed and it grinds a tad when shifting 1-2, especially when cold. I've been told this is normal because we have "truck" transmissions, meaning a very steep 1st gear. I wouldn't be too worried about it unless it becomes apparently worse. Changing fluid may help a bit, especially if you haven't changed it in a long time or ever. But don't expect miracles, it's just lubrication for the synchros.
-98 Wrangler Sport Chili Pepper Red
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