Re: Moving Washer to the Basement
8 feet ?? sounds high. I'm not quite sure the washer pump would be effective going that high --- it might.
Even so , you would be required cut that line , install a wye and come back a bit to make this a branch and have a "P" trap --- you may also need to vent that small branch as well.
Are you on a city sewer system? If so you probably have a vertical stack. Perhaps the washer can be relocated near there. This way a washer vented stand pipe can be installed around there.
"" an ounce of perception -- a pound of obscure "