Seven years of selling auto parts tells me that it is a GM 8.875" ring gear (meaning a 12 bolt truck rear, to the shade tree mechs). The fact that I put a National seal part #8835 in my 71 C10 12-bolt rear, which I looked up myself, and by golly it was right. Looking up seals and bearings is hard to do, due to the number of choices listed in the catalog, but after selling that seal hundreds of times for Chevy 1/2 ton 2wd and 4wd tells me it is so.
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'67 C10 short box fleet side wood bed small rear window frame off restoration. 396BB,Th400, ps, pwr disc 5 lug, posi 3.07, 2000 Suburban 60/40 pwr seats, 2.5" front drop 4" rear, powder coated running gear.
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