Not sure why anyone would say to steer clear of the ReadLift 4” SST kit, everyone has their company of preference or budget to stick to I suppose. I actually have the 4” SST kit installed from ReadyLift and have had zero issues, looks good, drives perfect, good lift height and looks almost level and yet the truck still fits in my standard height garage door.
Lifts 4” up front, and 2” in the rear so you end up with about a 1/2” rake when done (2.5” front lift makes the truck level, so it’s a level plus a 1.5” lift up front, then the 2” lift in the rear puts the back end 1/2” higher than the front, for a lifted/levelled look over all. Add in a set of 35 x 12.5 tires and you’ll get another 1” or so added to that overall lift.)
I can say from experience that the ReadyLift 4” SST kit was perfect for the lift and look I was going for and no complaints from me.