If its time to replace the ball joints in your Duramax, check out the offerings from ProForged. Laboratory tested and proven in the real world, ProForged ball joints feature improved design over the competition for increased longevity and durability, even in the most demanding conditions. Utilizing forged SAE4140 steel for the ball stud and forged SAE1045 for the housings, these ball joints are built to last, and with the included zerk fitting, you'll be able to service them to keep any wear over the years at an absolute minimum.