The Automann SS38-44 Series 3-1/2" Bushing Trunnion Shaft is designed to provide reliable performance over a long service life. This trunnion shaft is made from high-quality materials and meets all the necessary safety and performance standards. It helps hold the trunnion bushing in place on your Mack truck, ensuring that it is securely held in place and that it will not move or become loose. This trunnion shaft is easy to install and is designed to provide a secure fit. FleetPride is your First Click in Heavy Duty®.