I guess there are about the same # of moving parts as most 2-stage blowers. I guess the difference is that the Farm Kings (at least in this size range) kept it simple. The PTO shaft goes straight through to the impeller. ALong the way, there's a set of exposed bevel gears (under a flip-up shield) to drive a shaft running over to the RH side. From there, just a single loop of #50 (I think) roller chain runs the auger. All the bearings are off-the-shelf type sealed bearings held with stamped steel flanges, readily available in any farm store.
Buying used, I liked the easy-to-replace parts, especially the exposed bevel gears instead of some sealed gearbox. Figured with an older used unit, if a special gearbox shelled out, might be tough to replace. Big heavy bevel gears alone can be found or scavanged fairly easily. (i.e. I seem to remember some about that size on the back of an old Deere 6600 combine to run the straw beaters...)