Hi Ranger,
If you search the archives for 3/4 ton disc brake conversion you will find a couple of long threads on the subject. The parts used required light machining of the spindle to match the wheel bearings, and a large bracket to mount the caliper. I've taken a different route in adapting discs to my 59 3/4 ton. First I wanted a bolt on application requiring no machine work to the existing truck, second I wanted to use easily available parts (NAPA or equivalent), and third I wanted a caliper assy with it's own bracket which will make adapting to the spindle much easier. The rotor chosen is 72 or 73? (sorry can't remember exact year off the top of my head, I do have the part #'s) Ford F250 3/4 ton used with dual piston calipers. I chose this rotor because it is thinner than most 3/4 ton rotors and opened up my choices for calipers. It also uses bearings with an ID slightly bigger than the spindle. An evening on the lathe and I've made adaptor sleeves and the rotor is mounted on the stock spindle. The caliper used is a 96 Ford F150 dual piston. It comes complete with a bracket which locates the caliper and pads. To adapt to the spindle it will require basically a flat plate which will bolt to the spindle using the old backing plate mounting points, and the calpier will then bolt to this plate. This is the stage where I am right now. Once I complete the adaptor plate I will take some pictures and post in detail all the steps and part #'s used. This will require a 16" or larger wheel and I have no idea on clearance with stock wheels. I doubt the caliper will clear a stock wheel. I'm using new GM 3/4 ton 16x6" five spoke steel wheels, they will clear the stock tie rod ends by about 1/2". For the correct lugnut to adapt this wheel to the rotor go to
www.ezAccessory.com. Life is busy right now so it might be a couple of months before I post any finalized info. Be patient I'l post it eventually.
John
