On my 85 300 SD 617 motor after I had the pan off and on 3 times I still have a leak. It seems to be coming from where the line on pass. side of trans. that goes to radiator cooler where it connects on the trans. With 1 bolt. Right above this area is where the filler check level dipstick goes into trans. One of these places is the leak are these known to leak? If it is the area where cooler line attatches to trans is there just a couple of copper washers that just might need replaceing?