Allison 1000 LML 4X4 Output Shaft 2011-2015. This shaft is made in-house at TCS for heavy duty towing & competition applications. AllTCS shafts are made from Select Grades of Super Strength steel alloys and are approx. 50% stronger than the OEM versions. This 4X4 output shaft is: Made from 300M billet steel. Ideal for heavy duty service applications. Precision ground for high dimensional accuracy. Ideal for those who challenge their vehicles at work or at play.