I bought this kit for my 2004 Jeep Wrangler TJ. The ring and gear were packaged well and work great. Basic installation kits came unopened with everything needed to rebuild the differentials. the current ones do not flow. There's no reason not to change them until you've got everything sorted. I also recommend purchasing new shift forks. You probably won't need them, but if you're a weekend mechanic like me and it turns out you need them, it would be nice to have them without them. You can always return them if you don't need them.
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