The ATF is dark, nearly black

Hello,

You can do it yourself here's a guide to walk you through the job with instruction in the diagrams below:

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

In the diagrams down below I have included the instructions along with fluid type and capacity for the automatic trans-axle for your vehicle. Please go through this guide and get back to us with how everything turns out.

Thanks,
Alex
2CarPros