I have been given a ford explorer 4.0 sohc V6 by my old man, and my local ford dealership claims that they cant get me much bits/part numbers as its not on there system, is this true ?

Also when i brake the pedal vibrates ive been told either abs sensor or it may need new hubs !

I need a new front diff seal, not the drive shafts but where the prop goes into the front diff.

Can and does anybody who works at ford give me any part numbers/codes i may need for the ford explorer or do i need to order bits from the states ?