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Re: Gear Ratio
Cool build. That rear is a HO52. The HO72 is the dually 1 ton rear. Center sections interchange. They made 3 ratios for these rears 4.10, 4.57, and 5.14. Would stand to reason that you would have the 4.10's. If you have any issues with rear brakes, there are disc kits that are designed for them and also with a little work, 14 bolt stuff will work too.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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