All Lubelocker Gaskets Are Engineered Using An Elastomer Coated Metal Base Along With A Full Perimeter Sealing Bead. The Elastomer Beading Give You A Dry Seal That Performs Under The Pressures Of Temperature And Flexing Of The Axle. These Differential Cover Gaskets Are Trusted Where You Need Them Most Whether You're On The Track, Road, Dirt Or Sand You Can Depend On The Lubelocker Gasket. This gasket fits Chrysler, Jeep, Dodge A999, Also Fits A904, A998, A500 Transmission. No RTV needed for installation!