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Installed my Mag-Hytec rear diff cover after work yesterday and filled the rear diff with 4.5 quarts of Amsoil Severe Gear 75w-140. No friction modifier added. Right or wrong, that's what I went with based on what I've read. Did a quick 8 mile circuit while locking/unlocking the rear diff, various speeds, and hard acceleration. I didn't hear any chatter so I think I'm good to go. I'll report back if I notice anything. BTW, you guys weren't kidding. That diff oil is some thick and nasty smelling stuff. Had to use brake cleaner on everything it touched.