IMPO... with 3" of lift up front, I think you'll definately need the AAL's if not Blocks!
Don't know whether this will help or not, but
HERE'S what I did with a lift on my DC. I only went with a
minimal 2" lift. After installing the new coils up front and setting the truck back on level ground, it was obvious, that the front was a little bit higher than the rear, so we added the TRD AAL's. I think the pictures in the provided link, will kinda' speak for themselves.
In any case, if you've got 3" up front, I'm almost certain, you'll have a rear-end
"squat" to your truck. Especailly if your DC is 2WD!

In that case... you'll definately need the AAL's. But honestly, whether your DC is 2 or 4WD, I think you'll be gald you put them on in the end.
