Are rear wheel bearings replaceable on a jeep wrangler Sahara?

Yes, rear wheel bearings are replaceable on a Jeep Wrangler Sahara. However, it's a moderately involved job, often requiring specialized tools and some mechanical aptitude. It's not a simple "bolt-on/bolt-off" repair. You'll likely need a bearing press and possibly a wheel hub puller. Many people choose to have a qualified mechanic perform this repair.