Originally Posted by Remerson228
Are we even sure the truck has a Hemi? If so, when it goes into MDS mode, compression isn't released. The valves stay closed and the air in the cylinders remains trapped, acting as an air spring until MDS is deactivated.
Is the vibration noticable only while driving the truck or do you feel it while stopped in or out of gear?
Sorry I should have mentioned the engine size. It's the 4.7 (non-hemi). I only notice it when driving, it does not display the same behavior when idle.