yes it has a differential. Here is a nice teardown showing the inside differential and gears.
Borg Warner Egeardrive 31-03 8.28/1 - Page 3 - DIY Electric Car Forums
There are several gear choices available (all single speed), but most of them are 8.28:1 or 6.54:1 depending on whether it came from a Coda (6.54) or Azure (8.28) setup.