Yes, it can be done, but not right imo. Its how I adjusted mine before I got a kit. The weight must be off the front wheel being adjusted otherwise the weight of the truck will push the arms out as soon as the bolts are loosened. But theres a couple reasons why skipping the kits and doing it this way isn't desirable. For one its a pain in the ass, and two when you're re-tighten the front control arms they are at full droop. This keeps the control arm bushings in a slight bind when you lower the truck back to ride height. It's not good as it leads to premature wear. With the kits you can make the adjustments, and tighten everything down with the weight on the arms; keeping the bushings happy and making life way easier. Plus I think the kits hold the arms in alignment better (if you off road hard).
