I think you will find a difference in lenght on the shafts, as well as u joint size. I havent swapped a 3/4 ton coil rear to 1/2 ton, but have done a leaf truck.... I think there is a difference in the track bar & bracket(1/2 to 3/4). 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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