4L60E Rebuilt by a MASTER and some friends and I installed it because we knew how. It does not leak at the track while racing or while driving but only when we load it on the trailer or it sits in the garage over night. The round metal piece in the tranny housing broke and we have replaced it. I know for sure we have not overfilled the fluid. Not sure why it is doing this but it is about half a cup that comes out every time. Any ideas on how to stop this leak?

 

its coming from the bellhousing?

 

Find it.

Might be something as simple as a crappy cork
pan gasket. But it's time to get greasy, Mama.
Clean it off and find the weep. Then the cure
should be pretty plain.

 

LOLOLOL