[argonaut]

I think you may find that if you put a longer, "lift" coil spring up front that the upper control arm will be nearly sitting on top of, and maybe touching, the upper coil bucket on the 2wd crossmember. There won't be any room to install the rubber bump stop. You will have very little droop and when going over a big bump the UCA will hit the upper coil bucket, making an unpleasant slamming sound.

I installed 3/4 tons HD springs in my 64 1/2 ton chevy shortbed pickup (the HD have a larger diameter coil and a higher spring rate) to get as much lift as possible front and back. This didn't even come close to leveling the truck out, and I feel that my front suspension is just about maxed out. It simply wasn't designed to operate at that geometry. I think you'd have to do what the later model chevy truck guys do and make some custom spacers to drop the entire front crossmember down, relative to the frame.

I'm not trying to be a downer, but I think that is the reality of the situation. What kind of springs do you have in the rear of the truck?