I have a 76 dodge 3/4 ton power wagon 44 up front and a 60 h/d in the rear. I am doing the brakes on the front end and the book keeps making a referance to a greas zerk on the hub to pump full of grease. on my hubs i don't have one. on my brothers 1/2 ton he does have the zerk. Is there a differance with the size of axles or are mine the wrong hubs? any help is welcomed.