I just have broke in, and it runs great. But I have noticed the front end is pulling the truck, and hardly any power is beng sent to the rear axle. So i figured it needed heavier diff oil or put the center diff lock in. Well the allen head bolts are so tight that I snapped my good allen wrench off in it. So I went to the other side and thet are so tight that they will not come loose. Any suggestions well be appreciated