My longhorn is converted to 1/2 ton suspension.....yes I have caught a little guff over it  you can bolt in the complete front crossmember from a 73 up truck, by egging a couple holes(I cant help on which ones). I run the factory crossmember, & top arms. The bottom arms are 71-72 1/2 ton pcs. A 75 c 10 gave up the spindles, rotors, & steer linkage....new ball joints, & tierod assys were installed. all of the brakes(master, lines , hoses , calipers & prop valve) are from the 75. The rear diff(12 bolt , & brakes) are also from the 75. I run a manual disc , due to vacumn issues on a "warm" 455 Olds that was in the truck at the time. The later booster can also be adapted if you need to.....its not a bolt in deal tho. Good luck,crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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