I was very careful about all that - new B&M flexplate, converter looked good - no weights, never had 'em, and made sure everything was to match for a forged crank engine. Now I'm just not sure if I have a bad torque converter or a cast crank engine. And I'm probably confused about the internal.external balance vs. forged/cast crank issues. I always thought the forged cranks were internal/neutral balanced and the cast cranks are external balance.