Can anyone identify the hole in this photo, and what is supposed to go there? My son found it changing his oil, but the hole appears to be part of the transmission. It appears to be threaded on the inside but not sure on that. Nothing was there when he went to change the oil. Any thoughts? Any help is appreciated.
That transmission looks very similar to the one in my 92 C1500. Mine has a plug covering the hole. I can't find any reference in the manuals as to its purpose. The clutch slave cylinder is mounted to the front of the bell housing in this area. I'm guessing it is or was for accessing the clutch release mechanism, for lubrication perhaps.