Your steering gear box is the strongest gear driven part on your truck! Hands down! They are powerful enough to break spring center pins, pretzel tie rods, crack hardened frames, and if your wheels are locked tightly in boulders, break sector shafts that make you axel shafts look small (yes, I learned the hard way).They will wear, but they will not break internaly. The sector shaft is the main weekness with the box. I`d bet that you have a frame, not a box problem.