This may or may not answer your question.....my truck originally had a 3 core and when I installed a 4 core I had to replace the top brackets only. The brackets are fairly cheap.....around $10 if I remember right.
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--Ben
71 GMC Suburban 4X4
The "Beast"
388 CID Stroker, TH350, NP205, 8-lug D44, 14BFF w/ Detroit, 4.10:1 gears, 4-Wheel Disks 4" Lift, 35" MT/R's.
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