Coolant from tranny?

[SleepR 240sx]

Engine: s13 Blacktop sr20det

Okay so today when i got home from school I noticed my coolant reservoir was nearly dry. I poured some more in and filled it up and let it sit to see where it was leaking from. Well it looked at first like it was coming from the bottom radiator hose, but it wasn't. In fact none of the hoses had a leak. Jacked the car up and it was clearly obvious it was coming from a spot on the transmission right next to where the transmission bolts to the engine. So anyone know what's going on/had this problem before? My first thought was cracked block however I would have expected to find oil leaking as well. Only other guess is a busted freeze plug. Any ideas? All help would be appreciated.