so i have a bad shake and rumbling noise coming from the front driverside wheel. i have replaced wheel bearings ,cv shafts, shocks, tires, and tie rods. there is gear oil leaking out all the seals for the front differential . i havnt let the fluid get low. the bearings i could see when i pulled the cv shafts seemed fine but there was fluid leaking into the vent shaft on the passengers side. im not a mechanic so i dont no much about 4wd vehicles. are there bearing inside the differential that i cant see that can go bad and blow out the seals? im out of ideas . spent alot of money and have the same problem and its getting worse.