This noise is difficult to describe. It almost sounds like something that drags for a second and then engages or hits a stop and the noise stops. More of a clunk type noise. When I start the car and back up 10-20 ft or so it will do it. Shifting to drive and moving about the same distance will do it as well.
Its definately in front sounds like drivers side. At night when it does this it affects the headlights (momentary flicker). Engine runs fine, shifts fine too. I dont see anything obvious underneath. Front hubs have been replaced, car has 52k miles. Steering is fine. Somebody mentioned ABS solenoid cycling, another said solenoids in tranny. Sorry I cant describe it better, a very odd sound.