Years ago Pirate Bay made a big deal about starting a 3D model repository, but it really didn’t catch on. Too many places to get free models already. Granted there are some places you can buy really high detail models from movies and games (is gambody still around? Will I get a strike for mentioning gambody like I did on reddit?).
If you really want to torrent 3D models, I’ll tell you what I tell everybody. qBittorrent has a very nice search function that, once set up properly, will hit a lot of public trackers straight from the interface. If you have a specific model in mind, give that a shot. Or just search for “3d model” or “STL” or whatever, and you’ll get hits.