The bolts that hold the subframe to the transmission are a very specific length. The reason for this is because the transmission has blind thread bosses installed in the aluminum cover. The tread bosses are blind so that they won't leak fluid.
What you did was install longer bolts that punches out the blind/sealed end of the boss so now fluid will always seep out along the threads,
You have also spit the metal slug that was sealing the boss into the fluid cavity where it now will await a perfect opportunity to jump into the teeth of your meshing gears and total those.
Here is a picture of the inside of a normal sealed thread boss.
This thread boss has had its blind seal punched out by too long of a bolt.
It is very common for people to make this mistake.
You can only use teflon tape to seal in the seeping fluid and hope that the metal slugs that are now down in your fluid don't get churnned up and float into your teeth.