Vented gear spline lubrication

A power delivery system comprising:

• a driven shaft;
• and
• a gear box assembly comprising:
• a gear box shaft at least partially disposed in an outer housing and connected by a spline joint to the driven shaft, the gear box shaft comprising:
• an interior region;
• a reservoir dam that separates the interior region into a reservoir volume and a spline volume;
• and
• one or more gear box shaft venting holes formed through the gear box shaft near an end thereof;
• and
• a regulator disposed at least partially within the gear box shaft, the regulator including one or more regulator vent holes, wherein at least one of the regulator venting holes is in fluid communication with one of the one or more gear box shaft vent holes;
• wherein the one or more gear box shaft venting holes includes four gear shaft venting holes and the one or more regulator venting holes includes four venting holes that are directly aligned with the four gear shaft venting holes;
• and
• wherein the regulator includes tabs that mate with slots in gear box shaft that maintaining alignment of the four venting holes with the four gear shaft venting holes.