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Message: [QUOTE="mjonesjr, post: 208929, member: 1076"] So I crawled under my truck earlier this week to find that my rear diff cover had rotted allowing gear oil to seep through the cover. At one place on the cover, the steel was so week that you could move it with your finger. It probably didn't help the cover when the rear tank was leaking on it. [ATTACH=full]183349[/ATTACH] [ATTACH=full]183350[/ATTACH] So instead of getting a replacement ($50) or an aftermarket ($275), I went with a '08-'11 F-250 & F-350 aluminum diff cover. I picked it up at the local Ford dealer for $79 with a small bottle of Motorcraft friction modifier. The part number for the diff cover is [B]8C3Z-4033-A[/B]. You will have to get new hardware to mount the diff cover as the aluminum one is thicker than the OEM cover. Since they are exposed to the elements, I went with 5/16-18 x 1.5" stainless, stainless flat washer, and a stainless lock washer. Here is a comparison of the factory cover that came off my truck and the OEM '08-'11 Super Duty cover. [ATTACH=full]183351[/ATTACH] The Super Duty cover is installed with black Form-a-Gasket only. I thought since my housing was an older housing, I would be double safe than sorry. I used the black Form-a-gasket along with a Felpro Sterling 10.25 gasket. I put the Form-a-Gasket on the cover first and the gasket on afterwards. [ATTACH=full]183352[/ATTACH] [ATTACH=full]183353[/ATTACH] Got the cover installed and the bolts torqued to 36 ft. lbs. and the fluid installed. I went with 75w90 full synthetic fluid with the 4 oz. of friction modifier. [ATTACH=full]183354[/ATTACH] [ATTACH=full]183355[/ATTACH] [ATTACH=full]183356[/ATTACH] [ATTACH=full]183357[/ATTACH] [/QUOTE]