Went to replace the rear output shaft housing (for lack of the correct term) gasket last night, and noticed while scraping all the crud off the cast iron piece, that there is a hole in it. I don't think the design has ever changed TOO much over the years, but basically, there is the transfer case body, then this cast iron piece that in my case is where the VSS mounts, then a cast aluminum piece that holds the seal for the yoke. The hole is obviously there from when it was built, and intentional. It's about 1/4" diameter, opposite the VSS (so it points kind of towards the driver, up and to that side) and is open to the inside of the case. I blew on it, and there was no restriction. I assume that it is either a vent, or missing a rubber(plastic?) plug like on top, above the shift rails. It's not threaded. Anyone else know about this hole? The gasket/seal kit I bought didn't come with ANY plugs, so no clue if it's a vent that is supposed to be open (can't imagine that) or if it DID have a plug and that came out somehow.