Bet you split the pump. Yes you have issues If that is a stock tranny you had to kind of expect it with the power that comes from that level of fuel and air. Heck stock power and heavy towing can fry one of these let alone anything over 500HP
it was a rebuilt tranny from a local shop but i half expected it not to last. its going back to them on monday to have it checked out. i was leaning twords the pump also.