C to C on the spring pads on the longhorns, 1 tons, & 4x4s should be 40"(67-72). the width on the 73 up trucks diff will work, but the spring pads need to be relocated(I think they are 42 1/2" center to center. The later (73 up ) 1 tons should still have the 40" C toC on the pads.....that doesnt help much tho unless you want a duallie. you will also need to relocate the shock mounts, as the 73 up are fore & aft. 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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