I changed the transmission fluid in my '03 V6 and if your transmission is like mine, it has a hard fluid line going into the fill plug. It looked like a lot of extra work to get access to it letalone remove it. An alternative is to add fluid through the dipstick tube but it's only 1/4 inch in diameter so no regular funnel would work, and it has a guide attached to it so you can't even slip a tube over it. I made a adapter from a cap off of a windshield setting tube of uretane adhesive. The big end fits perfectly over the bottom of a regular transmission funnel, and you can cut the other end to the size you need to just fit into the dipstick tube. You still have to put some pressure down on the funnel but it didn't leak a drop.