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broke nnbs trans help please

I have a nnbs 6.0 with the 4l70 trans yank tt 3000 converter bb tuned arh long tubes and i keep breaking the rotor in the trans pump! And not while beating on it! I have the correct spacing the dowel pins look great no sign of egging out the holes in the flywheel I have the heavy pump rings to rev over 5500 rpm i don't get it this is the second pump and assembly ( pump body) I also have vette servos any input greatly appreciated harp
 
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