Do some torsion bar keys up front. McGaughy's makes some but you can also accomplish the same thing by using stock 3/4 ton keys. Out back, remove the blocks from the axle & install some 2" drop shackles. You may need to get the shorter 2WD u bolts for the axle. I know you have a 2WD, but with the torsion bar suspension, the rear axle came with 2" lift blocks. When you remove the blocks, there isn't enough thread available to tighten them down; the threads don't go up high enough. You'll need to get the shorter 2WD u bolts from a truck that came with coil springs up front. here's a good how to for replacing the torsion bar keys:

http://www.silveradoss.com/forums/to...sion-bar-keys/

check this out also:
http://www.silveradoss.com/forums/to...2-simple-drop/