please clarify the second part of your reply re"manually manage setting" and "automatic".
The distinction is whether you load audiobooks manually (by dragging and dropping audiobooks on iPod in iTunes), or you set the iPod to Sync Audiobooks (automatic syncing).
To set up automatic syncing, select the iPod in iTunes (click its device button on horizontal bar) to show its settings screen in iTunes window. Along left side (in the sidebar), under Settings, click Audiobooks. To the right, the iPod's Audiobooks settings screen is show, where you tell iTunes how to sync audiobooks. The checkbox for Sync Audiobooks turns ON automatic syncing for audiobooks.
NOTE: When you turn this ON, you also need to use automatic syncing for music, movies, and TV shows. Any of those items (including audiobooks) currently on iPod that are not in your iTunes library (on the computer) will be lost.
You can choose to automatically sync All audiobooks. Or sync Selected audiobooks. If you choose to select, set up the rest of that screen as desired. Then click Apply. When you use this method to load audiobooks, all audiobooks are seen as audiobooks on the iPod. On the iPod (when you play the audiobook), you go through Audiobooks (instead of Music) to select the audiobook. Then you know it is being treated as an audiobook, instead of a song.
If you load the audiobooks manually (it's not set to Sync Audiobooks), that's fine. However, you need to confirm the copy of the audiobook that is currently on the iPod is being treated as an audiobook, not a song. If you select it on the iPod by going through Music), then it is being treated as a song. Manually remove that audiobook from the iPod and manually add it back from your iTunes Audiobooks library.