So I'm converting my 91 to a DRW. I found a dually in the junk yard that I'm using on my truck. What I want to know is, will the rear brake cylinders work with the prop valve on the truck now. Also I need to change the shoes and hardware for the drum brakes but I don't know anything about fords. Also all I know about the truck this axle came off of was it was a 1980's ford ambulance. What F-series would these brakes come from or are most Dana 70 the same as far as brakes go.