Alright guys, what's the real difference between 1/2 and 3/4 ton 67-72 trucks?

[turbobuick1]

In terms of parts the factory put on? Are the control arms different? How are the frames different, if they are at all? How about steering knuckle/spindles? Brake calipers, master cylinder?

I've tried searching the board a little, I was hoping someone could point me towards a good reference. I wonder if the factory service manual specifies the differences?

Share the knowledge with a newbie guys!