My rear diff was making a horrible whine. Took to CBT originally for the diagnosis. Long story short, I challenged myself to pull the carrier and send it to @gearinstalls.com for some proper love and to save some coin. Pinion bearing was shot, wrong size bearing was used in the initial setup of the regear and air locker, etc.. Got it rebuilt to perfection and put it back in. No leaks. No RTV. Pretty pumped. Silent and feels like new. Air locker still works too. 81lbs, in case you were curious.