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- - Differential Question (https://67-72chevytrucks.com/vboard/showthread.php?t=399724)

DirtRider1357

04-27-2010 10:22 PM

Differential Question

Which models came with the 12 bolt rear in them.

USSkoval

04-27-2010 11:33 PM

Re: Differential Question

All 1/2 tons through like '83 had them.

Tx Firefighter

04-28-2010 06:08 AM

Re: Differential Question

My 83 had a 10 bolt factory and I have an 80 model with a 10 bolt factory. I believe 79 was the last full year for 12 bolts.

USSkoval

04-28-2010 09:50 PM

Re: Differential Question

After several searches on car-part.com, it looks like...

2wd could have 10 or 12 from '78-'81
4x4 could have 10 or 12 from '81-'83

So, '77 was the last year that everything had a 12 bolt, an '84 was the first year that everything had a 10 bolt.

DirtRider1357

04-29-2010 07:18 AM

Re: Differential Question

Ok thanks. Recently bought an 86 k10 with a 12 bolt rear and when i went to go get parts they said that truck didnt come with the 12 bolt lol. At least i now know to ask for something pre '79

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