I am planning to move my first floor clothes washer into the basement. There is a 4" soil stack I would like to drain the washer and a new laundry sink into. Can I use the clean out on the stack to drain into. It is approximately six inches off the slab. The stack is pvc but I am reluctant to cut into it if I do not have to.

It was my intent to have the set up be the 4" stack with a T-Y from it to a 2" drain pipe with a p tap, the laundry sink, the next in line would be a 2" drain pipe to a p trap to a 36" - 38" high 2" stand pipe for the washer drain. Do I need a separate vent anywhere in line from the washer to the soil stack?

Any help would be appreciated.

A 2" drain standpipe is installed with a trap above the floor for the waste line. Usually this is between 6 to 12 inches above the floor.
Install the hot and cold hose bibb valves and drain hose pipe so that they can be reached when the machine is in place. The drain standpipe should always be taller than your highest water level in the machine to add protection from back-up water and siphoning.
These are usually pre-fabricated 2 inch pipes (designed to fit into a standard 2-inch drain pipe) that have a built in trap and are available from your dealer in several lengths.
Commonly, they are 34" or longer but check your local code for length and diameter required in your area.

Do not need extra vent -- Hope this helps