The original rear radius rods were never engineered to take torque. They simply kept the rear axle square with the torque tube.

Rodders have used the stock radius rods with open drive line axles for years. Some get away with it. Some don't. But the fact is this practice is courting disaster.

You need something stronger. Check out the Pete and Jakes ladder bar set up. To pricy? Fabricate something similar yourself.