904 Case cracks

the vent hole is plugged so I know if the front pump seal is leaking or just an "over flow" from the vent hole. [I put the vent in the tail and ran a -3 line forward to the dip stick tube area.] this is just another way of "knowing" what is going on...in our little 904's! Next, this crack is NOT from my trans, but rather a friend of mine who is running a modified version of the "support brackets" I use the factory brackets and have had no problem. I tighten them to the case first and to the block next. No problems as of yet...300+ launches on the brake @ 4800 + rpm! I've broken ring gears, not transmissions!