Just bought a new 2010 F150 4X4. I don't like the rake at all. Anybody know if putting on a leveling kit would void the warranty?

 

The dealer can't void your warranty just because you put a leveling kit on your truck. They can if if causes damage to other suspension items, but it's up to the dealer to provide proof.

Do a search. It's been discussed in depth. More than a few times.