Stripped 727 Transmission cooling line

I ended up just drilling the hole to 5/16 and using a 1/4 pipe tap. I used a 5/16 flare to 1/4 NPT fitting. It's a paint in the *** getting the drill and a 5/16 drill bit in there. I had to remove the torsion bar, the small piece of brake line running from the proportioning valve to the metering valve and I also had to cut about 1/4" off the base of the drill bit. After all that I was just barley able to fit it in.