1/2 & 3/4 are the same frame. When you get into a 1 ton, you will find taller rails(big beefy section under the cab). the rails behind the cab are also a little taller. If you need a measure, I can get that a little later today 
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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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