Thanks for creating this video. I was specifically told by the part store owner to never use any additional material such as silicone or gasket maker to your gasket. I was very curious and asked why, he stated the Felpro blue gasket will absorb the gear oil and create the actual seal within minutes. Might be worthwhile to mention this next time as it provides an explanation that makes sense and add trust toward your product, just a suggestion! There’s a bet amongst my weekend mechanic friends this won’t work, lots of beers are on this one and I expect a whole camping weekend this coming summer enjoying their beers!

Used this today. Worked great!! Thanks again for making such a great product

This works... until it doesn't. For fancy billet or cast covers and stuff, I might consider a gasket. The issue is with most factory diff covers... they are stamped steel and when discussing a sealed gearbox like a differential case, the gasket allows for compression when you torque down the thin, stamped steel. That creates "waves" in the cover mating surface. The area around the bolts compresses and the space in-between the bolts can buckle upwards. Over-torquing makes the problem dramatically worse on top of it all, and is the cause of most jobs that leak. I recommend using RTV only (with stamped steel covers), and use the stuff designed for gear oil so it won't dissolve or break down. Personally, I use the Permatex brand (it is in a green tube and marked "for gear oil) , but I'm sure there are others rated for this use as well. As always, SUPER-clean surfaces and bone dry after a sterile scrubbing with brake-clean. And even with no gasket and just a thin layer of gasket maker, DON'T over-torque the thing, and DO let it cure before you fill. It may suck waiting, but no leaks is the name of the game here. If you find yourself in that bad spot, spend 30 bucks and replace the cover with a new one and do it proper. Some folks may have good luck using the gaskets, but I've found a 100% success rate using the RTV method and by proper torquing. Fel-Pro makes top-notch gaskets, but I wouldn't use one on this application.

Just what I was looking for.

For me it’s also just not having the hassle or risks with RTV, it’s harder to mess up the RTV and you also don’t have to wait the 24 hours. That’s great for a shop if they have them available.

Please start making for Ford SUPER 8.8

Well Im not knocking fel-pro but alot of people dont use the gaskets cause they dont trust them cause it seems they never seal and always leak. I mean the major auto makers seal there diff covers with RTV sealant from the factory for a reason and many auto repair shops do it this way to for a reason. Its the best way to seal the diff cover period. I will say this. Its how you prep the differential surface and diff cover surface that makes all the difference.

So you feel the Fel Pro gaskets are better then the Lube Locker gaskets? I'm about to install an aftermarket Diff cover on my 2011 Raptor and I do not not want any leaks afterward.

Hoping I'd see a question and reply about whether to use sealant with these gaskets. Bummer, guess I'll have to ask it. Does Permatex 80019 sound like proper compound to be applied to both sides of the gasket? RTV? Or, nothing at all?

What about rtv or gasket dressing?

Mines leaking love my life

I just put the gasket on dry. Normally I use a gasket sealer like permatex 80019. Sunday morning and I ran out of 80019. It sealed dry, it’s been a week.

Could i do i a thin layer of gear oil specific rtv on both sides of the gasket for my differential

Has anyone had luck using gasket only?

thanks for this. i'm having to do it over again. this time i'm using silicone to seal it. didn't seal with just the gasket. you owe me $25

Your gasket leaked on my differential 1 week later badly and turned into tissue paper. Your differential gaskets SUCK