Transmission service - Teach an old dawg new tricks!

Hellrats - I don't want to come off as an *** either. But, I did not ask how to check the fluid. I did not ask how to drain it. I did not ask about measuring or how to measure the amount that drains. I did not ask about how to know how much to put back in. Yet this is the information I read from your reply.
And check it hot idling in neutral. Be safe and block the wheels or use the e-brake if it works.