clunking noise when in reverse

could be your differentials popping in.

I have the same problem. I dunno what it is.

You should have four differentials and when you place it in another gear they pop in. I think thats why if you are on the gas and shift to drive your car will move than it jolts cause your differentials pop into place which makes a clunking noise. Not a big deal its norm. I think
:disappoin

Maybe a motor mount