In the never ending saga of wanting more than my budget allow, the Saab needs some preventative maintenance to extend its life until the budget allows for a CTS. It is time for a trans service. I’ve only found information online about drain and fill. My mileage puts me at the interval for a flush.
Is it possible to flush the transmission in your driveway?

A drain and fill takes about 4 qts while a flush takes just shy of 8 qts. Should I just do a couple drain and fills? That should get most of the fluid swapped. Right?

For your time.