it more than likely has an open differential. When you are stuck, does only one wheel spin? If so, talk to a local mechanic about putting in a posi differential. A posi is a set up that when it senses the 1 wheel spinning, it will apply torque to the other wheel and therefore both wills will start moving and help you get unstuck. Tire chains always help out to, but on a pegleg rearend " 1 wheel only turning" chains wouldnt be much help.