yes, the addition of the heavy cross sills on the box did effectively stiffen the frame(I think). the truck is much firmer to ride in, But not a complaint. if I jack up 1 corner, she still flexes somewhat, just not like factory. The old wood floor boxes IMO , had more flex than the steel floor versions. I still need a little help up front, but i think a good swaybar & bushings will help. I sure do agree that the stiffer cab bushings may not be for every build, just a matter of useage  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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