727 return line leak at tranny fitting

d55dave said

Yep, those conical seals work well. I too have used them in aviation. Are you sure the trans case isnt cracked from overtightening the pipe thread?

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Nope not cracked, the area where the fitting screws into the tranny is reinforced and the tranny shop where I took it to have the shift shaft seal replaced said that it pretty hard to crack the there. They said I could snap the fitting off before it would crack the case. They did say they have seen the case crack where in the back where the other fitting is because of over tightening