Also, the loads placed on the front axle, in terms of steering and braking are much higher than the rear axle. The blocks act as a lever and can cause your U-bolts to fail, which would leave you in a world of hurt. You can add leaf springs to your spring pack to achieve more lift, in an economical fasion, that is safe. It will ride rough though. Usually OK if you're gunna 4bye the truck. I like Peterson's 4 wheel and off road for lots of articles about tech stuff, and good adds. You can find a LOT of parts for your truck and turn it into a real ground pounder for not too much money.