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**Captainfab** · 04-19-2013, 12:02 AM

I agree. The original rear differential in a 1980 K10 should be a 8.5" 10 bolt. The last year for the 12 bolt in the K series was '79. In the C series trucks they were available thru '82.

04-19-2013, 12:02 AM	#3
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: 12 bolt rear end question I agree. The original rear differential in a 1980 K10 should be a 8.5" 10 bolt. The last year for the 12 bolt in the K series was '79. In the C series trucks they were available thru '82. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE