1986 Silverado Trans Leak

[sfaulkner]

Hey guys, i haven't posted in a while.  Got an issue that doesn't seem to be common.  When I put the truck in gear transmission fluid pours out transmission on the passenger side.  It look like it is coming from a sensor in front of the trans cooler lines.  What ever the sensor is, it is not connected to the plug dangling down there and seems to be the source of the leak.  Anyone ever had this, what is it so I can get one and what size is the bolt.  It's bigger that 1".

Thanks in advance