The transmission input shaft is tasked with transferring the horsepower that makes it through the torque converter and sending it to the transmission. Due to its placement, the part needs to be tough because it is subjected to a huge amount of rotational torque. The PPE Billet Input Shaft has been specially designed to withstand higher horsepower and torque levels that come with high performance engines or the added stress that comes with towing or racing. This shaft is highly recommended when installing our Stage4 or Stage5 transmission kits.