Sometimes when my car shifts into 3rd gear while cruising at very low speeds(say 50km/h), it emits a loud, metallic "thunk" from somewhere along the drivetrain.
It's a 3-speed auto, so 3rd is a very big gear for such low speed, but I'm not entirely sure that has anything to do with it.
This generally only happens when I deliberately back off the gas to stay at a constant speed.
The car doesn't 'jerk' as a resul of this or anything, so I don't think it's a serious issue- just a very annoying, loud noise.
Anyone ever experienced this before or could maybe give me some idea of what's happening?