72 should already have disc up front, came out in 71. 70 was the last year for drums up front.
The easiest way would be to find a disc front end from a 71 or newer (73 and up prefered) GM. The swap would be a direct bolt in. Replace brake hoses and new master cylinder and your off. You would probably want to goto power brakes because disc need more pressure than drums.
The rear would be straight forward as several companies make the brackets that use gm(dana44) rotors and eldorado(78-79) calipers. Good tech article on this very swap at www.coloradok5.com
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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 
Last edited by JIMs70GMC; 03-11-2003 at 02:19 PM.
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