Adding a washer drain to main drain in basement....

Hi Guys !!

I have been lurking in the shadows for awhile.....Great forum i always loved reading stuff here and i took your toilet reviews when i bought my new toilet.

I finally decided to register as i came across a problem and would like some advice.

The wife and i decided we would like to move our washer downstairs in the basement. We would like to move it to the left of the main drain stack.

The problem i am having is i am not to sure how to connect the drain & vent. I wanted to tap into existing cleanout but its a 3.5'' ABS and i can't seem to find anything that will fit.

Of course i would of readded a cleanout if it would of worked...so thats out of the question.

Then i thought of cutting the main stack but the height i would have to cut is over 18'' from the floor, cause there is the cleanout and a vent / drain that goes in the garage for a sink.

So cutting all above that to add a washer would be over 18'' from the floor and i am afraid it would be to high for the washer to drain properly ??

Any ideas.....how i can add a washer drain line ??? How would you guys do it ?

I would hate to dig up the floor as i don't want to spend big bucks.

I added some pics to give you guys a better idea of what i am up against.

Thanks in advance !