i want to put a leveling kit on my 2008 ford f150 lariat 4 wheel drive 5.4L what would be the best leveling kit if i want 3" or 4" leveling kit

 

wouldnt go 3" or 4". there have been several thread about guys who had problems. the angles of the CV and ball joints are bad with the 3". go fo a 2-1/2" autospring is good and cheap on eBay. daystar, Rize, procomp, readylift all make kits

 

I agree. In fact, I've never even seen a 4 inch leveling kit.
I'd recommend the Autospring kit.

 

a 3" or 3.5" would make your angles pretty extreme. If you really want a 4" lift you may want to look at the Rancho kits.

However if you want to use a leveling kit I'd recommend the AutoSpring as well.