Allison 1000 LML 4X4 Output Shaft 2011-2015. This shaft is made in-house at TCS for heavy duty towing & competition applications. All TCS shafts are made from Select Grades of Super Strength steel alloys and are 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.