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I have a MN12 IRS with a 8.8 center section. From what I read I can swap in a complete carrier unit from a solid axle 8.8. I have also read Explorers came with Trac Loc & 3.73 gears. I would prefer 3.56 but 3.73 is workable. How do I determine ratio? Tags? Codes? Locations? What ratios were available in the Explorers? I have 24 Explorers at the local Pull A Part so I may just find what I want.