Quote:
Originally Posted by 77 ChevySport
If the certain part (non-GM) was designed in the building/engineering phase it will be installed.eg.: 2016 Camaro COPO>Rear end is a Ford 9" rear! Larry 
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Correct - that's what I do for a living now, but I don't recall any stacks being designed or released with a GM part number back in the day, or any GM trucks going down the line with stacks.
I would have noticed that fer sure.
K