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Some are cosmetic, for sure. Some companies claim that the aftermarket covers they sell hold more lube which is beneficial in some way... I guess. MY 01' f450 has a finned aluminum diff cover from the factory to help cool the differential oil when towing or loaded heavy. As I stated above, the...

The upper hole is initially used to fill a dry or new axle assembly after a rebuild or when changing gears and internal components. Once the assembly has been filled and driven, the lower hole monitors fluid levels correctly. As long as 2 quarts of fluid went in, I was happy. I had maybe a few...

The advantage for me is strength against a rock strike. The cover is made from cast iron, so instead of getting a dent or torn open on a rock like the OEM stamped metal cover, it will get a scratch and be less likely to leak due to the rigid nature of the cast iron. we are planning a trip to...

After much research, I found a cheaper alternative to the ford performance M220 diff cover. The rear Dana 44 installed in our broncos is nearly identical to the rear axle used in the Wrangler JL Jeep. At $140.76 for the Dana Spicer OEM cover (Part # 10040651), it is far cheaper than what you...

a pretty awesome upgrade. is this similar to the 4600 bronco air lockers?