12 bolt

[sunnyc123abc]

Wat year trucks had 12 bolts, and what was the truck

 

[joedirt37]

i just took my 12bolt out of my 1980 k10,for a 14bolt,we know theyre n the early eighty models,noy sure what else though

 

[thatK30guy]

1/2 tons, up to '82 ran the 12 bolts.