I can tell you that any adjustment with the front end will require an alignment. Even just minor ones! I've got a story to back it up:
I had a 1998 Durango. After a few years, I got new tires (Bridgestone Dueler Revos, greatest tires I've ever owned!) Because the new tires looked much more aggressive than the factory tires, I realized I wanted to get rid of the factory rake, too. I climbed under and cranked the torsion bars just enough to raise the front end an inch. That's all I needed to level front to rear... just a measly 1" and it was perfect. I couldn't tell a single change when driving. I thought everything was great until around 3 months later I notice that my new tires were getting louder... and a month after that, the whole damn truck vibrated while driving anything faster than about 35mph.
I took my Durango back to the tire shop, and they informed me that the fronts were jacked up due to an alignment issue. I never saw it until they showed me, but the tires looked like a saw blade from the side. I leveled up with the service manager about what I'd done, and asked for help. He offered to order me 2 new tires under warranty if I'd agree to pay for an alignment. I thanked him and took him up on the offer, of course. Never had another issue with those tires again... smooth and quiet till the end and the most grip I've ever experienced in a tire. I plan to run those on my Denali when the factory tires wear out.
Bridgestone has a pretty informative page about alignments and how important they are. I am now a firm believer! :-)