All the bolts were still in place, and 1 of the 4 was still torqued to spec....the others were still tight but not to spec obviously because of the fracturing.

The car has been driven at road speeds for three weeks making a slight knocking noise from the bell housing since I last raced it.

I suspected a loose crank bolt or several ...but they were all tight.

Motor is internally balanced..and the converter was working fine.

So not really sure what else it could be...but theres a reason the ATI plate is 1mm thicker and has extra 'bulk' in the exact points this mp plate broke.......