[EricS76]

I'm in the process of putting a 14 bolt 10.5 in gear in my c-10. Here's what I've found. My 14 bolt came out of a 82 C-30 single rear wheel truck. The spring perches are narrower than my C-10's. It's not hard to change the perches. Just note what angle the stock ones are, cut them off, and weld on some new ones in the right place. If you don't have the tools for this, a welding shop should be able to do it cheap. Go slow and don't overheat the axle tubes. I'm going to use the driveshaft that came off the C-30. The U-joints are much bigger on for the 14 bolt. A u-joint exists that will adapt two different size joints, but I don't know if it'll work for this. I'd rather do it right anyway. The parking break hooks up fine, and I think the brake line will too, haven't gotten that far. As for U-bolts and spring plates, you should be ok if you go with the 3/4 ton axle i'm told. My axle is a one ton, and it uses square u-bolts mounted threads down, so I'm having to go with new u-bolts and spring plates.

The heavier GVWR 3/4 ton trucks should have the 10.5 inch 14 bolt. Easy way to tell is the 10.5 has a hub sticking through the rim when mounted on the axle, and the 9.5 inch 14 bolt doesn't, it's like a 1/2 ton axle.