This can be a good sign if you need to be lifted in some way. Dreaming of a jack indicates that you will use the tools at your disposal in the face of an unexpected change in your life or the need for assistance with a new part of your life. Jack being in a dream can also be a caution that you should be ready for any unexpected events that may arise.
If you have a dream about a tool jack lifting anything high, it's a sign that you need someone to pull you up to feel comfortable and happy. And that you need to improve your life's stability. There's a lot more than you're doing right now. If you're witnessing anything get jacked by the tool, it's a message that you want or needs to help someone in their life and that you want to feel accomplished.
You feel obligated to be someone in someone else's life because you don't feel like you're doing enough. When you need a jack, and there isn't one available, think about how you're not taking advantage of your tools in your own life. Typically, a jack would be associated with a car or something that moves, but in this case, the dream indicates that your own forward motion has been lost. You've lost your way or aren't sure how to pursue the next chance. Regroup in your life and refocus on your requirements.
Keep your focus on your goal, and make sure you're prepared for the worst-case scenario. Using a jack for something other than hoisting something – such as a weapon or just to sit on – is a sure warning that you'll be hassled on several levels. Consider persons in your immediate vicinity who might try to take advantage of you in some way. Giving or lending a jack or assisting someone in changing a tire is an example of being helpful to others. In a dream, this type of energy indicates that you are attracting favourable energies into your waking life.
If someone jacks (steals) something from you, it means you don't feel safe in your life right now, that you feel like someone is observing you in a negative way, that you feel vulnerable, and that you need to change. If you are uncomfortable, you must address the source of your discomfort. If you are watching someone jack something (steal) from someone else in your dream, it means you have something you are hiding from them. That there is something you aren't telling anyone about and that this shame or worry won't go away unless you address it.