leaking transmission

my 83 mustang was runnning fine except for a oil leak coming from the oil pan gasket, so i jacked up the engine to access the pan. after we put on the new gasket we brought the motor back down but now the transmission is leaking transmission fluid. it seems to be coming from the pan and also from the pipes that bring in the coolant. I dont know whats causing this or how to fix it
please help!!