You know that each set of springs is rated differently for each corner, don't you? Are you sure each of the spring sets you purchased are rated differently and that you put them on the correct side? Check the part numbers of the existing front springs. I suspect you may have a drivers side set on your front left.
But to answer your question, you would need to put the extended shackles on both sets of rear springs which would make no difference to the sag.
2013 D4 expedition equipped
1966 Army workshop trailer
(previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
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