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Old 07-11-2020, 10:36 AM   #5
gmc684x4
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Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 648
Re: Need help identifying my differential

I would look up axle code or pull the axles and measure them
Some time around 70 71 gm started putting wider axles in these trucks

looks like a 12 bolt can not see the whole cover count how many bolts in the cover should be 12 bolts
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