wroding

Hi Guys
This is my first post here. I have a g30 box van. Just recently i have noticed a fairly serious leak coming from the area between the tranny and engine. It is definatly tranny fluid on the ground. it seems to be coming from a drain hole in the metal shroud between the engine and tranny. Also the gasket around the tranny oil pan seems a little weepy. thats something i can take care of but i was wondering if there is something else i should look for? I am fairly capable in fixing things and would like to try and take care if it myself. The van has around 150k on it and the tranny is the original, i have taken care to service this van as it is a delivery truck and needs to be reliable.
I would appreciatte any help given.
cheers john.