Sagging Demon, Help

dont let anybody tell you they never wear out either.Ever bend a piece of wire back and forth?eventually it breaks.torsion bars are made of spring steel,but after years of flexing back and forth,and carry the weight of the car,they were,or lose there spring.MY 73 dart wont even hold the slant six up with the bars crancked all the way up.You need new torsion bars.