Hello,
I just got my 5hp18 tranmission filter in the mail, so I was about to change it out, but now I have confused myself with all the info I have read. So I have no Idea when the PO changed the fluid, I am going to say it was probably 50K ago, but who the hell knows. So my question is should I change part of it, which seems to be safer, or all of it? Changing part of the fluid just requires empting the fluid, changing the filter and gasket. Then refilling the amount you drained out, correct? And the car doesnt have to be running? Anything else that has to be replaced?