When coasting on my 07 RX350 AWD and let I go of the gas pedal ,then get back on the gas pedal, I hear thuds sound under the vehicle coming from the rear.
To me it seems like the front and rear don't sync on movement, hence the thump or jam sound ..

It happens only at the above scenario.

What I have done so far...
1.All rear sub frames have been retightened.
2.Differential mount and bushing changed. See pix of old and new installation

Pls what could be the cuse of this sound?
Any one with similar experience?
I am thinking the propeller or U joints or centre bearing.