The Dana Spicer Differential Cover Gasket is available for those who are experiencing a leak out of their differential. If the cover is in great shape then more than likely the gasket will be the culprit. This gasket is for the Dana 30, and has been made to meet or exceed the build quality of OEM components to provide the user with a reliable product they can depend on. If you have a leaking differential you can trust Dana Spicer products to take care of the problem.