To take the whole OD unit apart you have to compress the spring. A regular shop press is more than adequate. You can make a tool if you don't have the correct unit. A piece of pipe is fine and it doesn't have to be too tall. Pilot on that bearing/shim seat of the direct clutch sleeve. There is a safety ring inside that once compressed you remove then remove the snap ring and clutches for the direct clutch then slowly release the direct sleeve/hub. If you hit a brick wall PM me and I can walk you through it. Just keep things in order. Even better is have someone video you as you take it apart 😀 The direct clutch usually does not need replacing as it is always on until 4th and it is not affected but any fluid issues. The OD on the other hand sees a lot of use and is controlled by fluid pressure.