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The "square tube" frames that you are talking about did not come about until 1988 (I think). For sure, none of the 67-72 trucks had this. They are all the "sideways u" that you mention. So don't worry. The shackle flip will work if that is what you want.
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68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt.
"Friends call me cruzer cuz I like fast cars and fast women"
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