I haven't had my 4runner too long and I've noticed a very slight sag in the rear and I planned on buying new shocks soon, but I decided to just lift it 2 inches at the same time. I'm buying new KMC wheels and rock sliders for it soon. It's 2wd if that makes a difference. I just want to know what is the best type of coils and shocks to get for a small lift. It has 31" mud tires.