Nothing dificult about this but I figured I'd post it up for anyone interested in comparison of their own oil change . My truck 2014 QC 4X4 5.7L 6 speed xsmn 3.55 differentials, rear Anti-spin (LSD) Milage. First I drove the truck about 40 miles to warm up oil and collect any metal debris on a small but powerful magnet I installed before I took off. The rear drain plug is a 14 mm hex . The filler port is a simple rubber plug. I removed the Maget draggi it towards the drain and drained all the oil through a paint strainer . Be ready it comes out in a hurry especially when warm / hot . About 2.5 qts. Almost nothing in the stainer, just small metal debris , the least amount I've ever seen from a rear differential. I've only hauled my bass boat aprox 2,500 lbs fully loaded , and one 8000lbs camper pull for 45 miles for a buddy . Next I ran a magnet everywhere I could and used it to pull out the remainder of the oil in the bottom of the case . Filled it up to spillover out the filler port with Redline 75W - 140, this oil already has the Anti-spin friction modifiers additive for the clutch type LSD/ Anti-spin if your truck is equipped with. This oil also can be used in the non Anti-spin / LSD differentials as well. ☆☆NOTE☆☆ On the back of the bottle of RL oil it says if you have chatter in your LDS to add additional friction modifier . I have no chatter with my LSD . Once done I went to a large parking lot and did 10 ea full lock tight turns in both directions , no chatter for me . This is a test results sheet of popular gear oils , notice Redline is heads & shoulders above the rest . Hope this helps someone!