14-Bolt High Capacity Differential Cover for 9.5 Axles

Features:

• Fits 1980–2020 GM 2500HD/3500HD 9.5" axles
• High capacity for improved fluid volume
• Finned A356-T6 aircraft aluminum housing
• Black powdercoated with brushed aluminum finish
• Magnetic drain plug captures metal debris
• Anodized dipstick with magnetic insert included
• O-ring seal eliminates need for gasket
• Change fluid without removing the cover
• Built-in reference plug for fluid level checks
• Includes 303 stainless steel mounting hardware
• Improves cooling under towing or heavy loads
• Backed by a lifetime limited warranty

Give Your Differential The Strength It Deserves

If you're running a work truck, hauling serious weight, or just tired of your factory diff cover looking like an old tin can, the Mag-Hytec GM14-9.5 is the upgrade you’ve been waiting for. Built for 1980-2020 GM 2500HD and 3500HD trucks with 9.5-inch 14-bolt axles, this high-capacity differential cover offers more than just good looks. Its thick aircraft-grade aluminum housing holds extra fluid to keep your rear end running cooler, even under heavy loads or long hauls. The black powdercoated finish with brushed fins adds a clean, custom touch that stands out under the bed. Plus, you won’t have to fight with sealant or messy gaskets, Mag-Hytec’s O-ring design keeps things sealed tight with minimal effort. When it’s time to service your diff, the magnetic drain plug and dipstick help you do it faster and cleaner without pulling the whole cover off. Whether you're towing a trailer across the state or just want bulletproof reliability on the job site, this cover is built to handle the pressure.

Designed To Keep Heat Down And Fluid Clean

The Mag-Hytec GM14-9.5 differential cover is engineered for serious performance and long-term durability. Crafted from A356-T6 cast aluminum, it features integrated cooling fins that actively dissipate heat while increasing fluid capacity for added thermal control. The result is a cooler running differential, especially beneficial under towing stress, uphill climbs, or stop-and-go driving. The cover is sealed using ARP 568 O-rings, which eliminate the need for messy sealants and provide a reliable, leak-free install. A magnetic drain plug is positioned for easy access and works in tandem with the magnetic insert in the anodized dipstick to collect harmful metal particles suspended in the fluid. This helps extend the life of your gears by keeping contaminants out of circulation. The included 303 stainless steel hardware resists corrosion, ensuring everything stays tight and looking good even in harsh environments. With user-friendly features like a fluid level reference plug and quick-change access, this cover is as practical as it is tough.

Fitment: 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 GM Silverado/Sierra 2500HD/3500HD

Notes:

• Designed for GM 2500HD and 3500HD trucks with 9.5" 14‑bolt axles
• Covers model years 1980–2020 for applicable GM trucks
• High‑capacity design increases fluid volume over stock covers
• Cast from A356‑T6 aircraft‑grade aluminum for strength and cooling
• Cooling fins are machined into housing to maximize heat dissipation
• Black powdercoat and brushed finish improve corrosion resistance
• O‑ring sealing eliminates need for gasket or sealant during install
• Magnetic drain plug and dipstick capture metal particles in fluid
• Fluid level reference plug simplifies checking fluid height
• 303 stainless steel hardware resists rust and corrosion
• Allows fluid changes without removing the entire cover
• Backed by Mag‑Hytec lifetime limited warranty