PPE Diesel 128020000 Billet Input Shaft GM Allison 1000 And 2000 SeriesDescription PPE Diesel 128020000 Billet Input Shaft GM Allison 1000 And 2000 Series The transmission input shaft is tasked with transferring the horsepower from the torque converter to the transmission. Due to its placement,the part needs to be tough because it is subjected to a huge amount of twisting torque. The PPE Billet Input Shaft has been specially designed to withstand higher horsepower and torque levels (over 800 RWHP) that come with high