StReeTaCo31, anytime you lower a rear of a truck you MUST lower the bump stops because there's no room for your axle to travel. if you go lower them 4" you need to notch it.
inacoma, you should at least put something where the stock stops were, put a pair of flip flops or something
, because when you do hit that big pot hole on i-5 your your axle is gonna mess up your frame. metal on rubber is cool but metal on metal! yiiiiiiikes.