I check my tranny fluid today after some harsh shifting and noticed there was none on the dipstick!! I noticed a leaking metal line on the radiator which im guessing might be a transmission cooler line. I have not noticed a leak under the transmission just from the radiator. I should add the radiator was replaced like 6 months ago. Maybe an o ring is torn or something.

How hard would this be to fix as far as replacing the line

What transmission fluid should I use, also where do i fill it? In my honda I pour it right down the dipstick.. same procedure?

Thanks
Chris