I just bought this truck and was wondering what I need to fix or look at. Do these trucks have the 53 block? Where is this number located at? I would have found out earlier but how often do you run across a 99 4wd Auto Quad Cab Dually with 61000 origional miles real cheap. No rust, oil, there is some white crud on the valve cover and intake horn. Some minor oil leaks. Its all stock for now. Let me know and thanks in advance.