Another New Groan

2007 dc lb

I have noticed that I have a low frequency groan on start-up in the morning that seems to disappear as the vehicle warms. Thought maybe it was a cracked exhaust manifold or other exhaust part but haven't been able to find it. Other thought was maybe a broken motor mount but haven't seen any cracks in the frame mounts and haven't beaten the truck that hard. Anyone who has experience a broken mount, can you discribe the symptom?

Sound changes with throttle application - increasing in volume/frequency with throttle. once the truck warms a bit it seems to go away - bit is not coming from the engine.

This just goes along with the abs noise on the first roll out of my driveway -a low vvroom from the abs pump that last only a second.

Any thoughts?