Having just re geared my JKUR with only 3k miles on it I wud say get the kit. I got it for mine and to be honest I only used the new pinion bearing but the shims they give you make it so much easier to get the right shim since they give you like 20 different shims in All diff sizes. Since re gearing isn't somethung you want to have to do again I wud say do it right the first time spend the extra money get the over haul kits just my two cents.
2013 JKUR 4" Enforcer lift w/ 35" fierce attitude MTs , RR modular front bump w/ warnvr8k