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4th Gen Ram Tech2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
As far as indicators go, no. There's the ECO display but it simply means you are driving in a fuel efficient manner and may or may not be in 4 cylinder mode. V6 trucks have the ECO display as well.
You feel it, as a slight vibration, when you go to four cylinders. It just doesn't run as smoothly. Give it a little gas, and you can feel the smoothness, as the eight kick back in. It's almost seamless when it switches, but it can be felt.
Rpm drop? Read that before. I never see any RPM drop. I can feel and hear mine every second that it kicks in and out of MDS. But no rpm drop. Now when the torque converter locks or unlocks yes its a 300/400 maybe rpm up or down nut not MDS. When mine is in ECO its always in 4 banger mode.
Mine was seamless until the Magnaflow muffler. Then once I got tuned into the exhasut sound I can tell when it is or isn't at any speed. I play with mine sometimes to see how slow I can hold it and how slow or fast and such.
Yea, there are alot of posts on after market exhausts and a noticible sound difference from 8 to 4. It is my understanding when in MDS mode they sound horrible, that is why I never upgraded.