That would be your transmission. It may be slipping, or you may be lossing a gear. Have it checked.
Could be a bearing going bad.
most common is wheel bearings
tie rods
need to know what causes my car to make a heavy noise when driving. i have changed both front bearings but have discovered the noise still exist. Could it be a problem with the drive axlel?
A continuous thumping noise and floor shaking while driving on a 2000 Honda Accord could mean a loose exhaust system. It could also mean a bent frame or a broken spring.
The kids in the back.
what kind of noise?
Brakes
Bad wheel bearing
your keys?
mobile phones
fasten your seatbelt