2006 honda crv/awd/loud humming noise developes above 20mph,subsides when going uphill
noise 2006 awd honda crv noise from rear on 2006 Honda CR-V
Lots of moving parts under there. Center support bearings for the driveshaft to the rearend, axles, or the rearend itself. If a good visual inspection isn't enough you may need to bring it to someone. Good luck and Happy Holidays.
if your crv is AWD check rear end driveshaft and all bushing