Never recieved the jack and accessories? or just don't know where they are? If it is the latter, the subject is covered in the Owners Manual starting on page 5-86. It explains where the equipment is located as well as how to use it. If you would like to download a PDF version of the Owners Manual, you can get it here.
2008 Tahoe Owners Manual
If you really don't have the equipment in your vehicle, the only thing I know to tell you is to call a local repair shop for some assistance. Then you need to get with your local dealer to acquire the equipment that your vehicle is supposed to have onboard.
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