Because GM didn't make any 12 bolts from '83-'87. The last year for the 12 bolt in the C10's was 1982.
Quote:
Originally Posted by CoreyLeo223
Captainfab----- you wrote: "These brackets will bolt onto the truck 12 bolt rear differentials from '64-'82 and the 10 bolt truck differentials from '83-'87"...
What is the reason this wont work with a 12 bolt from an 83-87?
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