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I would also suggest LubeLocker. Last I looked they claim that their Dana 60 gasket doesn't fit the "Super 60" (front diff), but it does fit. Also, they might not have one for the Dana M275, if that's what you have in the rear.
Good call with the lube locker, people really seem to like them. I went with the felpro on my rear diff and it leaked almost immediately, pulled it apart again and resealed with RTV. Next time I will go with the lubelocker for the rear.
Lube Locker for Sterling and M275.
Nothing out there as far as gaskets for the M300 in the F350. I contacted FelPro and Lube Locker, they simply are not making them.
I used silicone, TA31 from Ford.
I don't see a gasket for the Dana M275 on the LubeLocker.com website. Did I miss it? I do have the gasket for the Dana Super 60, which has yet to be installed.
I did see a gasket for the "F6R140". Is that going to fit the 6R140? I know, duh, it's in the name of the product, but there's no description for it on their webpage and I don't think I've seen anyone on the forum use that gasket for their transmission.