Crank / balancer issue?

Most likely case is the rubber between damper and its pulley separated. Check if the timing mark is even close to TDC on compression stroke, using a timing light or stick your finger in the spark plug hole to feel pressure rise as you turn-over engine manually (ignition off). Bad main bearings give a deep thuddy sound under engine load. A bad thrust bearing would cause the crankshaft to move in and out axially. That is a common problem on Chrysler's 2005+ 2.4L engines after they stupidly changed to a smaller thrust bearing which fails. People say the crankshaft movement is obvious.