My washer has a pump that is too strong for the drains in this old house. From what I have heard, some kind of tight connection is OK as long as the washer has a pumped drain and not a gravity type.
Being an expert seat of the pants, shade tree type feller, I thought I better pass this by the pros here before I throw the switch.
I already rooted out the drain all the way to the sewer, and the roof vent is clear. Still not quite big enough for the newer washer.
Sketch of what I'm think about doing: