Yes! Low, bass sounding thumping that sounds like a medium-soft thump from a rubber mallet on the floor of the truck that is not consistent with engine RPM or wheel revolutions. After about 5 minutes, that sound turns into long low groans like a whale (but lower tone). I might get several of these groans intermittently lasting 25-45 seconds each that again aren’t tied to other vehicle rhythms. They can be loud, taking over sound in the cabin and causing several passengers to comment “…is that normal?” Then goes away after 10-20 minutes of operation.
I can also only replicate it if the truck has been sitting overnight.
Sound familiar? What do I do?
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