Thumping noise Options

[lagos]

Im getting a thumping noise on deceleration only. It sounds very similar to the noise you would hear if you had a flat tire. It is mostly noticeable where decelerating in 3rd gear, right around 2,000 rpm. Its hard to pinpoint if its coming from the left or the right side... kind of sounds like the clutch/trans right in the center of the front of the car.
Anyone deal with something similar to this?

My original diagnosis was that my axle that had been leaking grease was the cause of the noise, but I swapped the axle out for a brand new one (needed to be done sooner or later anyway). but the thumping persists.

Any ideas?

[sillica]

i get a thud in my rear left wheel when i get down to 2nd gear while braking, i take my disk of and clean the hand break pads and put wd40 on it, it seems to be ok after that than it starts again after a couple months, i think its dirt or lubrication or both.