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As far as 1/2 and 3/4 ton disk brakes go, the calipers are the same. The 3/4 ton rotors are 8 lug though. As far as the rear, you cannot put 3/4 ton brakes on a 1/2 ton rear end. You can do a disk brake conversion though in the rear and keep your 6 lug.
The front calipers are the exact same for 1/2 ton or 3/4 ton. The 3/4 ton front rotors are about 1/2" larger in diameter but since the caliper is the same you don't gain any better braking from it, just 8 lug. How many 8 lug 15" wheels have you seen lately? There are not many out there and I don't think there are any that are aluminum.
is there such thing as a double caliper that has a piston on both sides for better breaking.i think ive seen them on cars before.or maybe i was just dreaming it up.haha /forums/images/icons/laugh.gif
Yeah, the Fords use a dual piston caliper, but they also use a different caliper mount bracket.
I would assume with some fabrication, you could make the Ford calipers and brackets work and fit to a 1/2 or 3/4 ton axle. Just expect to spend some $$$ to get the job done. /forums/images/icons/wink.gif