Clunk when backing left

[Tailwind]

I rebuilt the suspension completely:
Shocks, including top mounts and bump stops.
Coffin Arms
Track Arms
Trailing Arms
Drop Links
Tie Rods
4-wheel alignment

First thing I did before asking was checked the torque on everything on the left side front...that's where the noise is coming from. The car has not been in an accident.
The Motor Mounts were replaced a year ago. This is a 1999. This issue just surfaced recently. It's not a creak. It's a like an audible 'crack' noise. It made all kinds of noises and rode like a buckboard when I bought it. Now it tracks great, handles great and rides like a 986.
One other thing...it seems to do it after it has been sitting for a time, i.e. overnight. It doesn't do it after that.