Originally Posted by brenx
I've had a closer look and the best way to describe it is shattered. It's got at least 4 major cracks in different areas. My guess is I broke it launching @ the track.
Launching could do it, especially if the rear mount isn't up to the task of holding the trans down.
Are both aligning dowls in the block?
Make sure the bellhousing bolts are not bottoming out before they exert the correct clamping force & use spring washers.
Was there any vibrations before you noticed the bell housing damage. Vibrations will crack bellhousings.