Guys, the reason for hop is spring wrapup, & u joint bind (leaf sprung). leafs are the worst for this hop problem! you wouldnt think the coil trucks would have a problem......but if the angles are a long way off , due to suspension mods, or line angle mods(back of trans raised 1 1/2")...that could do it  i would also suggest to check all the easy stuff 1 st ( bad bushings, stand the shocks up, ect). If the line angles are off far enough to get you to bind under hard throttle, you will see hop.....if you see it long enough, you will break some parts.....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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