transmission knock

Thanks for all the thoughts on my knock problem. Turned out to be the torque converter input collar. Half the collar had broken off at the drive notch for the tranny pump. It was still driveable, but I'm glad I parked it right away. Could have eaten up the front end of the tranny. I found a local shop that rebuilt the torque converter and put a new collar on it in one day for $85. That and half a bottle of Advil, and I'm back on the road. FYI... the guys who recommended against doing the rear main seal in car were right than they may have known. One of the pan bolts is hidden by the K-member so well that I couldn't even get a finger on it, let alone a wrench.