Digging for info - front drum explosion on 727s

Yes I’m lucky I didn’t wreck. Luckily is sheared off the rear driveshaft fasteners so the rear of the shaft fell down instead of the front. The transmission case broke into 3 pieces. It broke the tail shaft housing right in front of the rear mounting pad, the bell housing was in a 1000 pieces and the torque converter was wedged between the frame and floor. The center part of the case was most intact but it was sitting with the pan against the floor as well. The tail shaft was snapped off, the main shaft was snapped and the front pump was destroyed. Inside all the drums, bands and planets seemed to be ok except for the sprag. I’m not sure what really happened but it could have been something else because when the torque converter came loose it chewed the 4 lower transmission bolt holes off the block so I pulled the engine apart to see if I could reuse the rotating assembly in a new block I found that the crank was broken. I just don’t know if the crank broke the transmission or the transmission broke the crank.