It is a wet bell housing, trans fluid should be in it be sure to get sealed starter with a gasket do not use silicone as it will get into trans and stop up ports etc I always used copper coat for all gaskets even on head gaskets on older units never had issue in 45 years I'm a retired tech
35 years with Clark and 5 with Hyster and 5 Komatsu I have all Clark service manuals on flash drive if you can get me your email I can send it