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Im not sure what caused the difference, unless maybe you have a 30 series crossmember(just a guess). my 69 measures 2 1/8 " center to center on the holes(20 series crossmember). This should apply to the 10 & 20 series for 67-72. My longhorn has 10 series lower arms, & spindles. The lower cross shafts measure right at 1 1/2 "diameter. From what i understand......you replaced the lower crossmember with a notched unit from a diff truck?
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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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