[Lynn Eades]

Tony means BB-1175-C.

The 4 digit number (1175) in the middle is a base number and if you get the prefix or suffix wrong, you get a different hub seal for some other type of Ford. These seals have a tin extension that drops any leaked oil into a tin shield, which lets that oil run to the back of your brake backing plate, through a hole. It only works as a tell tale if the hole is clear. The bearings are supposed to be grease packed, so that an oil leak means oil has travelled through the outer and inner hub seals from the diff. There is normally an outer seal that stops the diff oil and grease mixing.