I have the new ford racing diff cover I put 2 quarts of fluid in and a bottle of friction modifier in and when I drive the fluid sprays all over out of the breather fitting. under side of the car mostly passenger rear suspension componets and all over the bumper. I checked the fluid today and put a little more in until it started to come out of the middle hole (filling from middle hole) I let it drip into a pan until it stopped dripping. I put the plug back in took it for a drive and it did the same thing how much fluid is required with the new covers?
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