[KeithT712]

Originally Posted by SnS C10

strange to me how a slight increase in rpm in park/neutral/drive makes that noise completely disappear

Another questions, the ride on the front end is pretty stiff. Does this have anything to do with the 2 shocks per side in front? Is there a remedy for the stiffness? I thought i read that you can remove one shock per side. Is this advisable and if so which one do i remove?

I had an 86 K20 that had the dual shocks in the front and it was a rough ride also, Ive heard switching to just single shock set up makes them ride smoother but haven't experienced the change for myself. And what Edahall said could also be the case, 3/4 tons usually aren't known for the best ride quality.
If you were to remove a shock from both you would want to remove the outer shock(i believe) the inner would function the same as a single shock set up, if there is a spacer up top it would probably have to be switched to go inbetween the one shock and the frame. I can take some pictures of my front end later to show the single shock lay out if needed