I got a TH350 in my sons hot rod and it’s had a leaky trans since the day we put it in. Not sure exactly where the leak is coming from. It’s got an aftermarket tube and dipstick so for all I know maybe it doesn’t register the correct level and maybe it’s as simple as me putting too much fluid in. Looks like the level is right about the pan gasket level when cold when it stops leaking. There is a tube right behind the circulation lines that looks to be open. Not sure what this is( pic). Anybody know?