Get it on level ground, if using highlift jack use wide base for it. Make sure someone is watching you and take flat tire and wheel off putting immediately under your jeep in case jack fails. Then put spare on.
A good friend was replacing rear axle shaft on the trail with high lift. People all standing around not paying close attention. The wheel was off and under the side of jeep (this probably saved his life!)He was under under the jeep at the diff. (Looking at ring and pinion for damage). Lucky for him he put tire under the side of the jeep. Jack slipped, gas tank was just resting on his chest barely allowing him to breath but not efficiently. Couldn't yell, people took a few seconds to realize what happened and grabbed jack to lift jeep back off of him. For that minute my friend was being crushed and could have died. Use common sense and have someone else there ready to help. Have someone stand by a highlift jack as well. I've seen many of them slip off the jack point.
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