[D13]

Other way around. The brake system was a hydoboost, with assist provided by power steering pump pressure. The steering box is the same as on any other truck. The diesel pump would have had slightly different hose connections, usually 1 more return line and/or a remote fill pipe. Pump guts are basically the same.

If you have a vacuum brake booster now use a regular power steering pump. if you have a hydroboost use the pump and lines off a 1 ton or diesel that origianlly was hydraboost equipped. Be sure the hose routing is correct (i.e. pressure to the correct side of the gear and the booster).