Those holes are for a factory floor shifter bracket. If the fluid is running down from the front of the holes it'd either the extension housing seal or the rear band shaft seal is leaking. To replace the rear band shaft seal you need to remove the extension housing and screw a 1/4" bolt into the pin and pull it out just far enough to replace the o-ring. Don't pull it out any farther than necessary to replace the o-ring or you'll let the rear band linkage fall apart inside
