Rear end clunk turning left

Look here:

http://www.moparts.org/Tech/Archive/axle/13.html

This will give you a general idea of how each one is designed. It's quite possible the clutches are shot, one or more of the gears inside is broke etc.

Like I said ( I can't say it enough) if you have to tear into it and have never done one, there are a few steps to take before you remove it from the carrier if your R&P are in good shape and you want to reuse them, quietly I should say.