With the motor not running, If you jack up the rear end real high, all the fluid will go to the front of trans and you will be able to see it dipstick or selector shaft seals are leaking, then lift the front up high and you will be able to see if rev band pin or any rear of trans leaks are occuring. also take wire off of nuetral safety switch and see if the brass pins are leaking. I went lately to Mopar dealer and they sell a reuseable rubber coated metal pan gasket for my Dodge duelly with O-Drive for about $11.00