Keys and springs
Spindles and springs
I think McG (not sure about Belltech) say that you have to at least have
17's, so you're good for spindles
Spindles, keys and springs - you're talking 5" territory now.....
Best ride will be spindles and springs vs keys in the front
3" rear drop "should" use shock extenders unless you trash the stock shocks
And you'll need to adust the Autoride if you keep the stock shocks also.
There's Belltech, McGaugheys, DJM, GroundForce...etc
There are supporting vendors here that have some GREAT prices, lots of opinions on which rides best etc