The best way to make sure a junkyard Jeep is in good condition is to have it inspected by a qualified mechanic you trust. If you are buying directly from the junkyard or repair facility, research the company to make sure it has a good reputation.
Junkyard vehicles typically have salvage titles, so it is also a good idea to check the status of the title. While a salvage title does not necessarily mean the car is in poor condition, it can make it more difficult to insure, and some states may not allow you to register it without certifying that it has been rebuilt and has passed a safety inspection.
You can also ask the seller for a detailed history of repairs, including the original repair estimate. Working with a reputable company is important, since an unethical seller may not be honest. Seeing the repair history can help you determine whether the Jeep ended up in the junkyard for minor issues, such as hail damage, or serious problems that may affect its reliability or safety. You can also buy a vehicle history report from sites such as CARFAX.com.
If you want to buy a working car, be sure to test drive it before you buy it. If you are buying the Jeep for a part, ask to test the specific part to make sure it is good.