Coolant leak unusual place

I have a coolant leak on a mounting bolt where the motor and transmission join. It seems to be a slow drip, not a steady stream. It is more noticeable after the engine has cooled. Any ideas would be appreciated.

1992 4.0 V6

Are you sure it's not drippimg onto that bolt from somewhere above it?

Yes that has to be what's happening. I noticed coolant on the floor when I drove the truck up on a pair of rhino ramps to service the tranny. It hadn't leaked until then. But anyway the radiator reservoir tank has not changed coolant levels.