I don't do rock crawling, mostly trails and overlanding. My '07 Sahara is factory stock with no lockers, etc D30/44 with 4.10s and it performs fine. I'm also on 285/70/17s. I plan to regear to 5.13s this year but that's only because my Jeep is a dog at the altitude I'm at (over 5,000 ft)...