Custom Differential Covers
Alien Machine Worx differential covers start as a solid block of 6061-T6 billet aluminum and is precision CNC machined in-house. We don’t cast or stamp our aluminum covers—we machine them for strength, precise fitment, and long-term durability. Built for work, towing, off-road adventures, and everything in between.
Trusted Axle Protection to Conquer Any Terrain
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Machined from solid 6061-T6 billet aluminum for exceptional strength and durability.
- Aluminum’s high thermal conductivity helps transfer heat away from the gear oil more efficiently than comparable steel covers.
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Available in durable anodized/Powder coat finishes for added corrosion resistance and a premium appearance.
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Easy, direct bolt-on installation — no modifications required
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Built-in ribbing for superior axle and gear protection
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Engineered for enthusiasts who demand durability and reliability.
- Most of our covers feature a built-in drain plug, eliminating the need to remove the entire cover during routine gear oil changes.
Rod Cotton
“It’s always a good time wheeling with the Alien Machine Worx family. Tim and his boys are just fun to be around. They make a great product and they are not scared to put it to the test. I can wheel with confidence knowing I don’t have to worry about my differential losing any fluid. It’s the area you won’t see until it’s too late.”
Arturo Soria
“When working with Alien Machine Worx, you not only gain access to a great group of guys that have the right attitude to get any task done, you get a top notch American-Made product that looks and performs phenomenally. Whether having a fun weekend of wheeling the Truckhaven Hills or racing through the brutal King of the Hammers Racecourse, there is a sense of relief knowing I can trust my Alien Machine Worx differential covers to protect the expensive axles, gears, and lockers that go into my hammer proof differential. I’ve found through trail wheeling and pushing my rig on tough Ultra4 race tracks, you can’t change what’s ahead, but you can arm yourself with the best parts available to handle every obstacle; Alien Covers do not disappoint!”
Brandon Barberena
“Being an offroad enthusiast for over 15 years, I know that differential protection is extremely important. This is why I choose Alien Machine Worx covers. I’ve had numerous diff covers over the years on various different axles and vehicles, none stand up to the quality and craftsmanship of Alien Machine Worx. These diff covers give me the confidence to explore the harshest of Rockcrawling trails in Southern California without having to worry about any damage to my axles.”