well...... my first welded diff it broke. the spider gears were only spot welded in four spots. I broke the welds just by normal driving. every time you accelerated or deccelerated you would hear a very loud "clacking" sound. that was from the gear backlash. then one night i took my car out to my spot and after the clacking got very ezzsive. i stoped at the light to leave, i went to go foward and my car didnt move, it stalled out. started it up again put in revese move back a little and then moved foward and drove to my friends house. we jacked up the car and spun the wheel. my right wheel would turn 1/2 full rotation until the welds on the spiders gear caught one of the other welds on the gear and lock together. it was pretty bad. so yes u can beak a welded, but mine wasn't welded correctly. even though it broke the welds it still locked up just fine but very noisy.