TCS Duramax Allison 1000 2000 2400 Main Intermediate Shaft Duramax Allison 1000 2000 2400 Main Intermediate Shaft As the Duramx power level keeps going up, TCS Products has been proactive to add a billet main/intermediate shaft to our Allison 1000/2000 lineup. Shaft is machined from 300M billet steel Stronger than the O.E.M. intermediate shaft Features an added lubrication hole for the P-3 sun gear and pilot CNC machined and precision ground Shaft is heat treated for added strength and durability The shaft through hole is gun drilled to provide a polished interior finish, eliminating internal stress risers If you need a Tech Manual, shift kit, Red Eagle Performance Master Kit or parts for your Allison 1000 rebuild please see our store or ask us we will be glad to accommodate all of your part needs.