Description: This rear differential cover is a must - have for 2020 - 2024 GMC/Chevrolet HD trucks with a 6.6L Duramax engine. PPE's HD A356.0 - T6 cast aluminum cover is designed to keep your rear diff looking great and running cool. It features thermal heat sinks and external cooling fins, which help maintain the differential oil within its ideal viscosity range, thus extending the differential's service life. Part Number: 138053000. GM OEM Part Number: 84757353. Features: Crafted from high - grade A356.0 - T6 heat - treated cast aluminum alloy, it increases oil capacity by 1.43 quarts. It's compatible with both 11.5” or 12” rear axles. Specially engineered internal ribs minimize friction and maximize lubrication. The durable, heat - treated cast aluminum ensures optimum heat dissipation, significantly reducing differential fluid temperatures. It also adds extra strength to the gear housing. The cover comes with a high - power Neodymium magnet - equipped, billet 304 stainless steel fill plug and a 1/8' stainless steel NPT port for an optional temperature probe.

Using this rear differential cover is straightforward. First, make sure your vehicle is turned off and has cooled down. Locate the existing differential cover and carefully remove it. Then, install the new cover in its place, ensuring it's properly aligned and tightened. When filling the differential with oil, use the billet 304 stainless steel fill plug. Note that this cover is designed specifically for 2020 - 2024 GMC/Chevrolet HD trucks with a 6.6L Duramax engine and 11.5” or 12” rear axles, so don't try to use it on other vehicles. For maintenance, periodically check the cover for any signs of damage or leaks. You can also use the 1/8' stainless steel NPT port to attach a temperature probe to monitor the differential fluid temperature. If the temperature seems unusually high, it might be time to check the oil level or the cover's condition.