Obviously there are other reasons why your diff might be leaking diff fluid like worn down O-rings, gaskets and outdrives if that's the case its probably time to replace the entire differential for the reason that its just old and worn out, but if you got a fresh built diff and it just starts to leak after a few runs or you put it away and next time you go to grab it and you see a bunch of fluid all over the place then you definitely want to try this fix out it would be a good idea to replace the orange O rings and the gasket THANK ME LATER...