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I know on the 3/4 ton dana44 axles the rotors and calipers are the same 71-78ish. But I believe the calipers from 1/2 to 3/4 are the same ones. Have you upgraded the rear to disc? That would be a performance increase. I seen somewhere that slotted rotors are available, need to remember where. Do not know of any performance calipers, except maybe to buy from a quality manufacturer. Also, replacing stock rubber lines w/ braided stainless usually helps though you probably could not feel the difference.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs
1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX
1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears
1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now.....
1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone.
1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed.
1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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