Difference in 1/2 ton springs and 3/4 ton springs
 

Would I be able to put 1/2 ton springs in my C20 without any other modification?

I know that I wont have the load capacity, but I don't care about that.

:canada:

Yes you can, the heavy duty 1/2 ton spring is exactly the same spring as a 3/4 ton in all aspects as they shared the same spring, so be sure you get a standard 1/2 ton spring and not a heavy duty, only difference in heavy duty & standard rear springs are the max weight ratings.
GMCPaul

Is that for the front or rear or both?