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Gear ratio from pinion gear stamp?

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07-28-2018, 06:05 PM	#1
mosel70 Registered User Join Date: Jul 2016 Location: Las Vegas, NV Posts: 116	Gear ratio from pinion gear stamp? I have a'70 C10 stepside. Appears the pinion gear stamp is NF GM86, hard to see in photo. I have photos of the other stamps on the differential exterior if that might help. Looking to swap trans from TH400 to 700R4 and need to know the gear ratio. Truck new had a M20 manual 4-speed. Thanks! Attached Images

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