I have a working post hole digger with an auger that's about 10" wide. I just used this to dig about 80 holes for fence posts and it worked great.
The gearbox has no gear issues but does leak oil. The common solution for these drills is to fill the gearbox with grease (actually called "corn head grease"). That eliminates oil leaks forever and is a common practice.
I have another drill snd augers with my primary tractor - so am selling this one. This includes the driveshaft (another $100+ cost for many similar ones for sale). Also has a strong pair of teeth and point (for cutting through loose rock, roots, hard soil).
Sold as-is. Ive provided an honest description. Can help load into a truck or trailer. Am disconnecting tonight so won't be able to demo (but have many holes that can show the results). Located near Springdale and Tontitown.