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gmc 2 speed rear

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    Help id old gmc semi

    Hello, I am new to the gmc forum and was hoping someone would be able to help me out. Was walking through a junkyard the other day and stumbled upon this truck. It’s a GMC D863 with a 6-71 2 stroke Detroit, spicer trans, a 2 speed rear, air brakes and a 5th wheel. Can anyone tell me the make...
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