[Saudade]

Well, you'll need to be a bit more descriptive about your clunking.

Does it clunk while the engine is running but in park?

Does it clunk once or repeatedly? If repeats, does it change with the engine speed?

Does it only clunk when you put it into gear?

Does it clunk while your driving? If so, does it change speed with when you drive?

Anything else you can do to describe the noise would be helpful.