if you are stock the best mod hands down is aggresive tires.
hack the fenders wich is free so doesnt count disco the sway bar and the differance is amazing. honestly who puts in a locker then shows up on the trail with a set of street tires.
your lockers arent going to do shit when you get a flat or cut a sidewall not to mention the shit youll get from your buddies who now halve to wait for your dumbass to change a tire not to mention that your dumbass probably doesnt have a spare, hell id be suprised if such a person could change a tire.
get some tires