The Stovebolt Site Forums The Shop Area Driveline 1946 3 speed Transmission bracket bolt

I have a 46 1/2 ton truck. 216 engine and 3 speed on the floor. I was looking for a transmission oil leak. Haven’t really found the leak yet but I noticed this bracket on bottom of tranny below the speedometer cable is missing a bolt. Would anyone know what size bolt it should be. I was also wondering if this hole goes into case and is the major place of transmission fluid leaking. I can put weed eater line in the hole. It’s a hard place to view without taking bracket off. Thank you for the help. Glen