I have a Kenmore washer model # 41743042200. The wash cycle works OK, but when it goes into the final fast spin, it makes a loud knocking noise. What can I do to repair it and what parts are needed for the repair?

Unfortunately I have some bad news for you. With this washer, that problem is usually the rear drum bearing. It is not replaceable as a single part. You replace the inner basket and the rear half of the outer drum. Open the door and reach inside and try to lift the basket from near the front and you will probably find your problem is the rear drum bearing by up and down play in the basket. Repairs out of warranty for this are just not economically viable. You'd be looking at in excess of $450, probably quite a bit more. Some of the models have the entire outer drum and basket as an assembly, but still not economical and not something a novice would want to try.