</font><font color="blue" class="small">( Finally a picture of the crack. Think I'll try epoxying it this week. Thanks for all the tips. )</font>
In my experience, epoxy has a slim chance to work. The problems are that the surface and interior of the crack are oily, which will prevent the epoxy from adhering well. Also the thermal expansion usually loosens an epoxy patch.
I think that welding, or drilling and plugging are realistic options, but both require that the transaxle be partly or fully disassembled to avoid damage and/or contamination to the trans. A good mechanic with a shop manual could pull it off.
paul