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There is a few places it can be leaking from. The best way to diagnose a leak is to get a pressure tester. You can pressurize the system to the amount the radiator cap says. Normally around 12-18 psi. You do this cold allowing you to quickly locate the leak. I suspect it is leaking from the back of the intake manifold dripping down and hitting the gear box. Here is a link to a pressure tester you can get from any auto parts store. http://www.harborfreight.com/radiator-pressure-tester-kit-69258.html This is a nicer one you can get any inexpensive one will work that they have in stock.