Welcome to PS.
One thing I will suggest is that you stay away from the F150 keys, if I was you I would just bottom out the keys you have now for more lift… the F150 keys is to much lift and inturn puts your CVs on to drastic of an angle, some will say that is not a big deal but I ran them on my truck for about 15k miles and had nothing but problems with my 4wd and front suspension. Yes it is a cheap way to get more lift but when it comes to IFS spend the money.
You may want to look into Skyjacker, they started a 3" kit for the Silverado/Sierras a few years ago (at the time was $850 which was rear blocks instead of full springs) and what was nice about it was you didnt have to drop the front diff if I remember correctly.