I was checking the front diff fluid and noticed the ADD hardware hanging off the front diff. Is this something that needs servicing? I saw the vacuum lines and my heart kinda sank because this trucks 25 years old and I've been finding all kinds of neglect as I go through it. I searched for a manual conversion but didn't find much. I would like to simplify any systems I can. Honestly I would rather not have it at all but I guess that's no possible.