PPE's Performance Engine Mounts are a no-brainer upgrade for any GMC/Chevrolet HD truck owner seeking superior durability, performance, and reliability. The OEM motor mounts on these trucks were made from cheaply formulated rubber and deteriorate over time, as well as being susceptible to shearing - not ideal for heavy-duty applications. Many HD trucks have worn or sheared engine mounts, resulting in excessive vibration, drivetrain misalignment, and even damage to surrounding components.