Update:

I found that on the oil cap, they have stamped the torque specs of 25nm. When torquing it to that (I have a craftsman digital torque wrench) the rubber gasket ring squeezes out beyond the cap making it leak. Tightening the filer cap, just enough so the rubber ring is compressed just to the point where it begins to deform & squeeze out, isn't tight enough to stop the oil from leaking out too.

I noticed that this happened as soon as I put 100% synthetic oil in. Has anyone else had problems with synthetic oil leaking past the oil filter cap?

Oh, the tranny oil seems fine...no leaks.