73-87 are 4.5" lkonger wheelbase than 63-67, plus may be a differnece of frame rail length before front axle and after rear axle which would have to be cut off or added to to make same as 67-72, ive never actually taken the effort to measure other differneces other than width and wheelbase, but i have weighed a longbed 2wd frame with aut crossmember minus frotn cradle and it was 200 lbs total, bare 12 bolt axle housing is 75 lbs, cradle is real light, spindles with rotors and calipers mounted are 60lbs each for light duty 1" rotors spindles, cant remember right now what 12 bolt chunk with gears weighs
Last edited by Fast68Chevy; 11-14-2002 at 06:08 PM.
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